How to determine the direction of the magnetic field next to the energized wire according to the rig

Hold the energized wire with your right hand:

The thumb points in the direction of the current, and the four fingers that bend the wire around the direction of the magnetic inductance line.

Essence: The magnetic inductance line around the energized straight wire is a set of concentric circles centered on the wire, and the closer to the wire, the stronger the magnetic field, and vice versa.

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 the force, and the right-handed rule is used for the other (generally used to determine the direction of the induced current).

This point is often confused, and it can be found that the word "force" is left-handed, so use the left hand; And the word "electricity" is handed to the right, so use the right hand) to memorize the formula: left power and right electricity.

The left hand is flattened so that the thumb is perpendicular to the other four fingers and is in the same plane as the palm. Put your left hand into the magnetic field, and let the magnetic inductance line perpendicularly penetrate the palm of your hand (the palm is aligned with the n pole, and the back of the hand is aligned with the S pole) (tips for doing the question, when doing the question, the general cross-section is x (the direction of the current is inward) or the point (the direction of the current is outward), as long as you remember, if there is a fork, the back of the left hand is below: if it is a point, the palm of the hand is below, and after that, the fingers will be in the direction of the current, and the thumb is the direction of the force. Four fingers pointing in the direction of the current (i.e., the direction of the positive charge movement) Then the direction of the thumb is the direction of the conductor force.

It is used in electric motors and other applications where amperage is applied.

The direction of the palm and fingers of the right hand to memorize the direction of the current generated when the wire cuts the magnetic inductance line, i.e., extend the right hand so that the thumb is perpendicular to the other four fingers and all in the same plane as the 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 for determining the direction of the induced current when the wire cuts the magnetic inductance line, and the right-hand rule determines the relationship between the coil current and the direction of the magnetic inductance line it generates, and the relationship between the current direction of the magnetic inductance line cut by the conductor and the direction of the conductor movement.

The direction of the current generated when the wire cuts the magnetic inductance line can be memorized by the direction of the palm and fingers of the right hand, i.e., the right hand is extended so that the thumb is perpendicular to the other four fingers and all in the same plane as the 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. The right-hand rule determines the relationship between the coil current and the direction of the magnetic inductance line it generates, and the relationship between the current direction of the magnetic inductance line and the direction of the conductor movement.

Physical Applications:

A rule that determines the direction of the induced current in a wire moving in an external magnetic field, also known as the motor rule. It is also the law for judging the relationship between the direction of the induced current, the direction of the conductor movement, and the direction of the magnetic field lines.

The direction of the kinetic electromotive force determined by the right-hand rule conforms to the law of energy conversion and conservation.

The right-hand rule can also be seen as a special case of Lenz's law.

In the law of rotation of rigid bodies, the direction of the moment obeys the right-hand rule, that is, the four fingers circle in the direction of less than the angle from the direction of r to the direction of f, and the direction represented by the thumb is the direction of the moment.

The above content reference: Encyclopedia - The Right Hand Rule.

The right-hand rule is a physical electromagnetism that is mainly used to determine the direction that is independent of the force. Generally, it is used to judge the relationship between the coil current and the direction of the magnetic inductance line it generates, as well as to judge the relationship between the current direction of the magnetic inductance line and the direction of the conductor movement. When the right hand is flattened, the thumb is perpendicular to the plane of the other four fingers, put the right hand into the magnetic field, let the magnetic inductance line enter from the palm, and the thumb points to the direction of the wire's movement, then the direction of the four fingers is the direction of the current induced in the wire.

Spread the right hand so that the thumb is perpendicular to the other four fingers and all in the same plane as the palm. Put the right hand into the magnetic field, let the magnetic inductance line enter from the palm of the palm (when the magnetic inductance line is a straight line, it is equivalent to the palm of the hand facing the n pole), and the thumb points to the direction of the wire movement, then the direction of the four fingers is the direction of the induced current (dynamic electromotive force) in the wire. Generally know any two of the magnetic field, the direction of the current, and the direction of motion, allowing you to judge the third direction.

This passage is mentioned in Physics Elective 3-2, Unit 1).

Right-handed spiral rule: (i.e., Ampere's rule) Hold the solenoid with your right hand so that your four fingers are bent in the same direction as the solenoid's current, and the end of your thumb is the n pole of the magnetic field generated by the energized solenoid. For the magnetic field of a straight current, the thumb points to the direction of the current, and the direction of the curved four fingers is the direction of the magnetic inductance line (the direction of the magnetic field or the direction of the North Pole of the small magnetic needle or the direction of force on the small magnetic needle).

Electromagnetism - Explanation of the right-handed spiral rule.

The relationship between the direction of the current of the energized straight wire and the direction of the magnetic inductance line can be judged by the rule of the right hand straight wire (note the difference with the judgment of the energized solenoid), hold the straight wire with the right hand, the straight thumb is consistent with the direction of the current, and the direction pointed by the curved four fingers is the direction around the magnetic inductance line.

The medium is in a non-uniform magnetized state, that is to say, usually the magnetic field lines inside the medium are in a curvilinear state and unevenly distributed; In addition, since there are electric insulators in nature, there are no magnetic insulators (except for superconductor substances), so there is magnetic flux leakage in the usual magnetic circuits.

By using magnetic wires, the direction of the magnetic field in energized wires can be determined. When a magnetic wire is placed in a wire, it vibrates or moves in a certain direction, and the direction of the magnetic field in the energized wire can be judged based on the direction of vibration or movement of the magnetic wire.

The direction of the palm and fingers of the right hand to memorize the direction of the current generated when the wire cuts the magnetic inductance line, i.e., extend the right hand so that the thumb is perpendicular to the other four fingers and all in the same plane as the 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 for determining the direction of the current induced when the wire cuts the magnetic inductance line, and the right-hand rule determines the relationship between the coil current and the direction of the magnetic inductance line it generates, and the relationship between the current direction of the magnetic inductance line cut by the conductor and the direction of the conductor movement.

It consists of holding the energized straight wire with your right hand and pointing your thumb in the direction of the current. Then the curved four fingers pointing is the direction of the magnetic field.

Lorentz forceThe right-hand stator is used to determine the direction of the electromagnetic. "The left-handed rule.

It is also called the motor rule, which is used to determine the direction of force on a current-carrying conductor in a magnetic field.

Flatten the right hand so that the thumb is perpendicular to the four fingers, magnetic lines.

Perpendicular through the palm of the hand, the direction of the finger is consistent with the direction of the movement of the conductor, and the direction of the four fingers is the current induced in the conductor.

(induced electromotive force.

in the same direction as the induced current). Chain take.

Lorentz force judgment method:

Flatten the left palm so that the magnetic lines pass through the palm of the hand, and the four fingers indicate a positive charge.

The direction of movement, which is perpendicular to the direction of the thumb of the four fingers, is the direction of the Lorentz force. However, it should be noted that the kinetic charge is positive, and the pointing of the thumb is the direction of the Lorentz force. Conversely, if the moving charge is negative and the direction of the charge motion is still indicated by four fingers, then the opposite direction of the thumb is the direction of the Loren and Witz force.

Another way to apply the left-handed rule to a negative charge is to think that the negative charge is equivalent to a positive charge moving in the opposite direction, and use four fingers to indicate the opposite direction of the negative charge's motion, so the thumb pointing is the direction of the Lorentz force.

The above content reference: Encyclopedia - The Right Hand Rule.

In general, the magnetic inductance lines around an energized straight wire are concentric circles centered on points on the wire. The specific judgment method is: hold the straight wire with your right hand, so that the direction of the thumb is consistent with the direction of the current, then the direction of the other four fingers is the direction of the magnetic inductance line.

The thumb refers to the direction of the current, the direction of the four fingers around is the direction of the magnetic field, the circle is vertical inward, and the fork is vertical outward! Satisfied!

There are two cases of the right-hand spiral rule:

One is the energized straight wire, at which point the thumb refers to the direction of the current;

The second is the energized solenoid, at this time the thumb refers to the direction of the magnetic field in the tube.

One point is perpendicular to the paper face outward, and a cross is perpendicular to the paper face inside the paper.

The direction of the thumb is the n-pole, and the direction of the magnetic field is from the n-pole to the s-pole.

The direction of the magnetic field of an energized wire can be judged by the left-handed rule.

If you put a straight wire on electricity, then put it in a uniform magnetic field, and the conductor will be moved by the action of the electromagnetic force f. The direction of the current will not change, what needs to be judged is the direction of movement of the conductor under the action of electromagnetic force, and the relationship between the direction of the current, the direction of the magnetic field, and the direction of the electromagnetic force can be judged by the left-handed rule.

Stretch out the left hand, the thumb is perpendicular to the other four fingers, the magnetic field lines pass through the palm of the hand (that is, the palm of the hand faces the n pole), the direction of the four fingers is the direction of the current, and the direction of the thumb is the direction of the force of the energized conductor (that is, the direction of the electromagnetic force f).

Judgment of the direction of the magnetic field of the unenergized wire:

If the straight wire is not electrified, then put it into a uniform magnetic field to cut the magnetic field line. Then an induced electromotive force (according to the law of electromagnetic induction) is generated in the conductor, and the relationship between the direction of the current, the direction of the conductor's motion, and the direction of the magnetic field can be used by the right-hand rule.

Stretch out the right hand, the thumb is perpendicular to the other four fingers, the magnetic field lines pass through the palm of the hand (that is, the palm of the hand faces the n pole), the direction of the thumb is the direction of the movement of the conductor, then the direction of the four fingers is the direction of inducing electromotive force (that is, the direction of inducing current). <

The relationship between the direction of the current of the energized straight wire and the direction of the magnetic inductance line can be judged by the rule of the right hand straight wire (note the difference with the judgment of the energized solenoid), hold the straight wire with the right hand, the straight thumb is consistent with the direction of the current, and the direction pointed by the curved four fingers is the direction around the magnetic inductance line.

The medium is in a non-uniform magnetization state, that is to say, usually the magnetic field lines inside the medium are in a curvilinear state and unevenly distributed; In addition, since there are electric insulators in nature, there are no magnetic insulators (except for superconductor substances), so there is magnetic flux leakage in the usual magnetic circuits.

You can use the cross gesture (the index and middle fingers of the right hand form a cross) to test the direction of the magnetic field around the energized straight wire, before attempting the test, point the middle finger of the cross gesture towards a straight wire, if the index finger points due north, it indicates that the north pole side is facing the straight wire, and if the index finger is pointing due south, it indicates that the south pole side is facing the withered straight wire.