Induced current and induced voltage 20

Reason for choosing d: We know that the magnetic field passes through the wire frame that can conduct electricity, and only if the magnetic flux changes, it will cause the formation of electromotive force, and therefore the current will be generated (condition: there must be a closed loop. So in the case of the above question, we know that in a magnetic field, there is a part of a closed circuit that moves in the magnetic field, but we don't know how the conductor moves, when it moves in the direction of a non-parallel magnetic field: it may accelerate, it may be uniform, it may decelerate; When moving parallel to the direction of the magnetic field, no matter what motion is done, no electromotive force is generated. Now, as long as these possible movements are analyzed, it is not difficult to find the answer d.

Hope this stuff helps you.

Pick D. Don't be misled by habitual thinking. If it is a cutting magnetic inductance line (that is, the direction of velocity is perpendicular to the direction of the magnetic inductance line), plus a closed circuit, then there must be voltage and current, if it is not (that is, the direction of speed is parallel to the direction of the magnetic inductance line), then there is no voltage, and there is no current...

c Take a good look and say, you don't even know about Faraday's experiments? If there is a current, there is not necessarily a voltage, and if there is a voltage, there must be a current.

Only the movement of the cutting magnetic inductance line can induce a current.

ABC exclusion.

d It is not possible to judge whether the magnetic inductance line is cut or not.

b There is a voltage to have a current, but it is not necessarily a closed circuit.

If there is a change in the magnetic flux passing through a closed circuit, then an induced current is generated in the closed circuit. That is, there are two conditions for generating induced current: 1. The circuit is closed.

2. A part of the conductor cuts the magnetic inductance line in the magnetic field. When the conductor is stationary in the magnetic field or moves parallel to the magnetic inductance lines, the magnetic flux does not change, so no current is induced in the closed loop, no matter how strong the magnetic field is.

The concept of induced current.

Induced current refers to the induced electromotive force in a closed loop. When a part of the conductor in a closed loop moves in a magnetic field to cut magnetic inductance lines, the magnetic flux in the closed loop changes, and the resulting electromotive force drives the flow of electrons, eventually forming an induced current. A part of the conductor of the closed circuit cuts the magnetic inductance line in the magnetic inductance line, and the current generated is called the induced current, which is one-sided, and the conductor can also generate the induced current without cutting the magnetic inductance line.

How to determine the induced current.

Use the right-handed rule, i.e.: extend your right hand so that your thumb is perpendicular to the other 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.

If there is an electric current in the closed liquid line, there must be an electromotive force (the principle of water flowing to a lower place).The current is caused by the electromotive force of the power supply.

The electromotive force produced in the phenomenon of electromagnetic induction is called induced electromotive force.

The part that generates the induced electromotive force is used to cut the magnetic field lines.

The body of the movement is held as a power source.

The magnitude of the induced electromotive force and the magnetic flux passing through the closed circuit.

The speed of change is related (i.e., the magnetic induction intensity of the coil cutting the magnetic field lines.

The length of the conductor, the cutting speed, and the angle between the coil and the direction of the magnetic field line are related).

Physics Textbook Formulas (and Explanations):

The electromotive force produced in the phenomenon of electromagnetic induction. It is usually represented by the symbol e. When the magnetic flux passing through an unclosed coil changes, there is no induced current in the coil, but the induced electromotive force remains.

1. When a part of the conductor of the closed loop moves in the magnetic field to cut the magnetic inductance line, the magnetic flux in the closed loop will definitely change, and the induced electromotive force will be generated in the closed loop, thus generating an electric current, which is called induced current.

2. As long as the magnetic flux passing through the closed circuit changes, an induced current will be generated in the closed circuit. Therefore, "a part of the conductor of a closed circuit cuts the magnetic inductance line in the magnetic inductance line, and the current generated is called the induced current" is one-sided, and the conductor can also generate the induced current without cutting the magnetic inductance line.

The current in which the magnetic field generated in the original magnetic field of a closed loop prevents the change of the magnetic flux of the original magnetic field is called an induced current.

When a conductor placed in a variable magnetic flux closes into a loop, the electromotive force drives the flow of electrons, resulting in an induced current (induced current).

Generally speaking, when a part of the conductor of the closed loop moves in the magnetic field to cut the magnetic inductance line, the magnetic flux in the closed loop will change, and the induced electromotive force will be generated in the closed loop, thus generating an electric current, which is called induced current.

Determine the direction of the induced magnetic field generated by the induced current: Due to the change in magnetic flux, an induced current is generated in the closed coil, and the induced current generates a magnetic field. If the magnetic flux in the second step increases, the direction of the induced magnetic field is opposite to the original magnetic field, and if the magnetic flux decreases, the direction of the induced magnetic field is the same as that of the original magnetic field.

Induced current is a current in which the magnetic field generated in the original magnetic field of a closed loop prevents a change in the magnetic flux of the original magnetic field.

Generation conditions: As soon as the magnetic flux passing through the closed circuit changes, an induced current is generated in the closed circuit. Therefore, "a part of the conductor of a closed circuit cuts the magnetic inductance line in the magnetic inductance line, and the current generated is called the induced current" is one-sided, and the conductor can also generate the induced current without cutting the magnetic inductance line.

**Conditions under which the induced current is generated.

The power of the induced current refers to the power of the work done by the current generated by the alternating magnetic field inside the magnetically conductive object to overcome the internal resistance of the object. Some are useful, such as induction cookers, which rely on induction currents to generate heat; Some are useless, like the heating of the transformer core.

The current in which the generated magnetic field prevents a change in the original magnetic flux is called an induced current.

A part of the conductor of a closed circuit moves in a magnetic field to cut magnetic inductance lines.

The induced current is the current generated by a metal conductor under the action of an alternating magnetic field.

To put it bluntly, the current generated by the magnetic field that prevents the change in the original magnetic flux is called an induced current.

In layman's terms, it means that two magnetic fields are on a plane, and the magnetic field blocks the current produced by the variable of the other magnetic field, which we call the induced current.

The changing magnetic field produces an induced current.

When a part of the conductor of a closed loop moves in a magnetic field to cut magnetic inductance lines, the magnetic flux in the loop changes, resulting in an electric current.