What are the responsibilities of the left hand and what are the responsibilities of the right hand i

I'm a sophomore in high school.

The rule of the left hand (to determine the direction of the ampere force and the direction of the Lorentz force): Extend the left hand so that the thumb is perpendicular to the other four fingers, and all are in the same plane as the palm, so that the magnetic inductance lines enter from the palm, and the four fingers point in the direction of the current, then the direction of the thumb is the direction of the ampere force (Lorentz force) sold by the energized wire in the magnetic field.

Ampere's rule Hold the wire with your right hand so that the direction of the straight thumb is the same as the direction of the current, and the direction of the curved four fingers is the direction in which the magnetic inductance line is around.

Ampere's rule (another way of saying): Let the four fingers of the right hand be bent in the same direction as the annular current, and the direction of the straight thumb is the direction of the magnetic inductance line on the toroidal wire.

The right-hand rule: In electromagnetism, the right-hand rule mainly determines the direction independent of the force. If it's about force, it's all about the left-handed rule. That is, the left-handed rule is used for forces, and the right-handed rule is used for others (generally used to determine the direction of the induced current).

Pure hand-hitting. Hope.

Left hand (direction of judgment): 1. Ampere force Four fingers are the direction of current, the magnetic inductance line is passing through the palm, and the thumb pointing is the ampere force direction; 2. Lorentz force The four fingers are the direction of positive charge movement (the opposite direction of negative charge movement), the magnetic inductance line is passing through the center of the hand, and the thumb pointing is the direction of Lorentz force.

Right hand (judging current and magnetic field): 1. Right hand rule (suitable for cutting) Stretch out your right hand, the thumb points to the direction of movement of the straight wire, the magnetic inductance line is passing through the center of the hand, and the four fingers point to the direction of the current; 2. Right-hand ampere rule Stretch out your right hand, when the thumb points to the direction of the current (straight wire), the four fingers point to the direction of the magnetic field. When the four fingers point in the direction of the current (energized solenoid), the thumb points in the direction of the magnetic field.

1. The left-hand rule.

The left-hand rule, which can be called the "motor rule", is the law that determines the direction of the force of the energized wire in the magnetic field, which is the force of the magnetic field on the electric current, or the force of the magnetic field on the moving charge. The content is: put the left hand into the magnetic field, so that the direction of the four fingers is the same as the direction of the current in the wire, then the direction of the thumb is the direction of the force.

Whether it is a DC generator or an alternator, they all work on the same principle, the difference is that a DC generator has a commutator, while an alternator does not have a commutator. It is suitable for situations where the direction of the current is perpendicular to the direction of the magnetic field.

2. The right-hand rule.

The right-hand rule, which can be called the "generator rule", is the law for judging the direction of the magnetic inductance line around the energized wire or the north and south poles of the solenoid, the direction of the magnetic field, the movement of the cutting magnetic inductance line, and the direction of the electromotive force, which is the direction of the induced current.

The content is: hold the wire with your right hand and point your thumb in the direction of the current, then the direction of the four fingers around is the direction of the magnetic line. Hold the solenoid with your right hand and bend your four fingers in the direction of the current in the solenoid, so that the end of your thumb is the north pole of the solenoid.

It is only suitable for judging the movement of some conductors in a closed circuit to cut magnetic inductance lines.

The right-hand rule: one is Ampere's rule, hold the solenoid with your right hand, let the four fingers point to the direction of the current in the solenoid, then the end of the thumb is the n pole of the solenoid. Second, it is suitable for the generator palm is the direction of the magnetic field, the thumb is the direction of the object movement, and the finger is the direction of the current, and determines the direction of the dynamic electromotive force generated in the conductor when the conductor cuts the magnetic inductance line and moves.

Note: The object is a straight wire, and the velocity v and magnetic field b must be perpendicular to the wire, and v and b must be perpendicular to each other, and the right-hand rule cannot be used to determine the direction of the induced electromotive force. Left Hand Rule:

The relationship between the direction of the magnetic field, the direction of the current, and the direction of the force exerted by the magnetic field on the current can be expressed by the "left-handed rule". Extend your left palm so that your thumb and four fingers are vertical. Put the left palm into the magnetic field, so that the magnetic inductance line passes from the palm of the hand to the back of the hand (that is, the palm of the hand is opposed to the n poles), and make the four fingers point in the direction of the current, and the thumb refers to the direction of the current by the magnetic field.

Electromagnetism Oersted experiment shows that there is a magnetic field around the energized wire, and the direction of the magnetic field is related to the direction of the current, which is called the magnetic effect of the current. The magnetic field on the outside of an energized solenoid is very similar to that of a bar magnet.

The two ends of the energized solenoid are equivalent to the two poles of a bar magnet, and their magnetic properties can be determined experimentally by pointing the small magnetic needle, the external magnetic field of the energized solenoid starts from the n pole and returns to the S pole, and the inside points from the S pole to the n pole. With amperdine, the n-pole of the solenoid can be determined by the direction of the current. Magnetism The phenomenon of generating an electric current due to the movement of a conductor in a magnetic field is an electromagnetic induction phenomenon, and the current generated is called induced current.

Conditions for induced current: When a part of the conductor of a closed circuit moves to cut magnetic inductance lines in a magnetic field, an induced current is generated in the conductor. The phenomenon of electromagnetic induction is the principle of generators.

This is all I typed word by word, I hope it will be useful to you Just copy it in your personal file now Thank you.

How to Improve Physics Scores The Concept and Difference Between the Left Hand Rule and the Right Hand Rule The Concept and Application of the Left Hand Rule The "Left Hand Rule" is also known as the Motor Rule

The left-hand rule is also known as the "motor rule". It is a rule that determines the direction of force on an energized conductor in an external magnetic field. The method of this is:

Extend your left hand so that your thumb is perpendicular to the remaining four fingers and all in the same plane as your palm. Suppose you put your left hand into a magnetic field, so that the magnetic field lines enter the palm perpendicularly, and the other four fingers point in the direction of the current, and the direction of the thumb is the direction of the force exerted by the magnetic field on the current.

The right-hand rule is also known as the "generator rule". A rule that determines the direction of the induced current in a conductor as it moves in a magnetic field.

Extend the stone hand so that the thumb is perpendicular to the other four fingers and all in the same plane as the palm. Suppose you put your right hand into a magnetic field, so that the magnetic field lines enter perpendicular to the palm of your hand, so that your thumb points in the direction of the conductor's movement, and the direction of the other four fingers is the direction of the induced current.

Right-hand spiral rule] indicates the rule of the relationship between the direction of rotation of the right-hand spiral shank and the direction of spiral advancement. For example, in the Cartesian right-handed coordinate system, the direction of rotation from the x-axis through 90° to the y-axis is the direction of rotation of the handle, and the z-axis follows the forward direction of rotation. Another example is when the angular velocity is expressed by vectors, if the direction of rotation follows the direction of rotation of the screw shank, the spiral advances.

Generally, the left hand is used when using force, and the rest is the right hand.

Inside the circuit, the direction of the current and the magnetic poles in the solenoid.

The direction of the current is upward, left n and right s

The direction of the current is downward, left s and right n

There is the left-handed rule and the right-hand spiral rule in it.

The left-handed rule judges the ampere force. There is a spiral rule on the right hand.

The left-handed rule The determination of the ampere force when an energized wire is subjected to a magnetic field in a magnetic field.

The right-hand rule determines the direction of the induced current generated by the conductor when it cuts the motion of the magnetic inductance line.

The right-hand spiral rule determines the direction of the magnetic field of the energized wire (coil).

The left-handed rule is only determined by ampere.

The right-hand rule The direction of the current when the conductor moves in a magnetic field, the north and south poles of the electromagnet, and the change in the magnetic flux in a closed circuit.

It's just that in high school, and after college, it's not very clear.

What is related to the force Lorentz force etc is the left-handed rule, and the direction of the electromagnetic field current etc is determined by the right-hand rule.

It's easy to remember the last stroke of these two words: electricity, force. The last stroke of electricity is to the right so it is used to judge electricity, while the last stroke of force is to the left, so it is used to judge force. If you don't believe me, go back to the book and read it! Satisfied.

Tell you a simple notation! Left force (the force is skimmed to the left, so the left hand measurement is related to the force.) ）；Right electricity (a curved hook of electricity is bent to the right, so the right hand is measured in relation to electricity,);

Memorization method: Left hand force, right hand electricity.

In the high school physics section, there are three "rules": left-handed rule, right-hand rule, and ampere's rule (right-hand spiral rule.

Left-handed rule: 1It is used to determine the direction of force on a energized straight wire in a magnetic field.

2.It is used to determine the direction of force on charged particles in a magnetic field.

Method: Stretch out the left hand, so that the thumb is perpendicular to the other four fingers, and are in the same plane with the palm, let the magnetic line pass through the palm, and make the four fingers point to the direction of the current, the direction of the thumb is the direction of the ampere force on the energized wire (defined in the book), I want to say a little here, is it not the left hand rule can only judge the direction of the force, my answer is yes or no, when judging the direction of the force, is to know two to seek one (to know the direction of the current and the direction of the magnetic field to seek the direction of force), Therefore, it is also possible to know the force and current to find the magnetic field, or to know the force and the magnetic field to find the current.

Right Hand Rule: 1When a straight wire used to determine motion cuts a magnetic inductance line, it senses the direction of the electromotive force.

Method: Stretch out the right hand, so that the thumb is perpendicular to the other four fingers, and all are in the same plane as the palm, the direction of the thumb is the direction of the straight wire movement, and the direction of the four fingers is the direction of inducing electromotive force.

Ampere's rule (also known as right-handed spiral rule):

1.Determine the magnetic field around the energized straight wire.

2.Determine the north and south poles of the energized solenoid.

3.Determine the direction of the magnetic field of the toroidal current.

Method: Hold the energized wire with the right hand, so that the direction of the straight thumb is consistent with the direction of the current, then, the direction of the curved four fingers is the direction of the magnetic inductance line;

Hold the energized solenoid in your right hand and the direction of your four fingers is the same as the direction of the current, and the direction of your thumb is the direction of the North Pole.

There are also left and right hands when the hand is stretched out and flattened, the thumb and four fingers are in the same plane and the thumb is perpendicular to the four fingers, and the amperine is spiral.

Left Hand Rule:

Left-handed rule (Ampere's rule): Knowing the direction of the current and the direction of the magnetic inductance line, the direction of the force on the energized conductor in the magnetic field, such as an electric motor.

Stretch out your left hand, let the magnetic line pass through the palm of your hand (the palm of your hand is aligned with the n pole, and the back of your hand is aligned with the S pole), and the four fingers point to the direction of the current, so the direction of the thumb is the direction of the conductor.

The principle is: when you draw the magnetic inductance lines of the magnet and the magnetic inductance lines of the current, the two magnetic inductance lines are intertwined, and according to the vector addition, where the magnetic inductance lines of the magnet and the current are in the same direction, the magnetic inductance lines become dense; Ground in the opposite direction.

square, the magnetic inductance lines become sparse. One of the characteristics of magnetic inductance lines is that each magnetic inductance line repels each other! Where the magnetic inductance lines are dense, the pressure is high, and where the magnetic inductance lines are sparse, the pressure is smallSo the pressure on both sides of the current is different, and the current is pressed to one side. The direction of the thumb is the direction of this pressure.

Right-Hand Rule: A rule that determines the direction of the induced current generated in the conductor when the conductor cuts the magnetic inductance line motion. (Generators).

The content of the right hand rule is: stretch out the right hand, so that the thumb is perpendicular to the other four fingers and are in the same plane as the palm, put the right hand into the magnetic field, let the magnetic inductance line perpendicular to the palm of the hand, the thumb points to the direction of the conductor movement, and the other four fingers point to the direction of the induced current.

How should I use the Left-Handed, Right-Handed, and Right-Hand Spiral Rule?

It's not a matter of memory. The content of the left-hand rule and the right-hand rule must be very clear to the students. The main problem I encountered with my classmate was that he didn't know that he should use his left hand to decide a specific problem after getting it.

Then, it is still time to use the right-hand rule. This is a key. The key to the problem is to ask students to figure out what the physical phenomenon is when the left-hand rule is applied and what kind of physical phenomenon the right-hand rule applies.

The left-handed rule says that the magnetic field exerts force on an electric current, or the force exerted by a magnetic field on a moving charge. In this case, you should use the left-handed rule, which is the key. After the judgment is made, it is time to use the left-handed rule, and the left-handed rule should be followed.

The relationship between the three directions is not too big a problem. The phenomenon applied by the right-hand rule is the direction of movement of the induced current generated by the wire when the wire is cut in the magnetic field and the magnetic inductance line moves.

The right-handed rule is used. The direction of the magnetic field, the movement of the cutting magnetic inductance line, and the direction of the electromotive force are the way in which the current is induced. This kind of question is right-handed rule.

If the left thumb points in the direction of the changing magnetic field, the direction around the four fingers is the direction of the induced electric field.

The left-hand rule is used for motors and the right-hand rule is used for generators.

1. Application of the left-handed rule.

1. Judge ampere force: Extend the left hand so that the thumb is perpendicular to the other four fingers, and all are in the same plane as the palm; Let the magnetic inductance line enter from the palm of the palm and point the four fingers in the direction of the current, so that the direction of the thumb is the direction of the ampere force of the energized wire in the magnetic field.

2. Judge the Lorentz force: flatten the left palm, let the magnetic inductance line pass through the palm of the hand, the four fingers represent the direction of positive charge movement, and the direction of the thumb perpendicular to the four fingers is the direction of the Lorentz force.

3. The left-hand rule can still be used in the scene of the motor, because the force is generated under the action of the magnetic field in the closed circuit, the left hand is flattened, the palm is aligned with the n pole, the thumb is perpendicular to the four fingers together, the four fingers point to the direction of the current, and the direction pointed by the thumb is the direction of the force.

Second, the right-hand rule is applied.

1. The direction of the current generated when the wire cuts the magnetic inductance line.

Extend your right hand so that your thumb is perpendicular to the remaining four fingers and all in the same plane as your palm; Let the magnetic wire enter from the palm of the hand and point the thumb in the direction of the wire movement, then the direction of the four fingers is the direction of the induced current. This is the right-hand rule that determines the direction of the current induced when the wire cuts the magnetic inductance line.

1. Precautions for the left-handed rule.

1. The left-handed rule is not the left-handed spiral rule. There are left-handed and right-handed rules: left-handed rule, right-hand rule, right-hand spiral rule, but there is no left-handed spiral rule.

2. The mantra of the left hand and the right hand in high school physics: left force and right electricity, which means that the left-hand rule is used to judge the direction of force, and the right-hand rule is used to judge the direction of electricity.

2. Precautions for the right-hand rule.

1. When applying the right-hand rule, it should be noted that the object is a straight wire, and the velocity v and magnetic field b should be perpendicular to the wire, and v and b should also be perpendicular to each other.

2. The right-hand rule can be used to judge the direction of the induced electromotive force, such as the right-hand generator rule to judge the direction of the induced electromotive force of the rotor of the three-phase asynchronous motor.