What are the conditions for the use of augmentation, contraction, and expansion in physics?

Increase, contraction, expansion in physics, is Lenz's law.

The conditions are as follows: 1. The original magnetic flux passing through the circuit.

direction, and whether it is increasing or decreasing;

2. Determine the direction of the magnetic flux generated by the induced current in the loop according to the above meaning expressed in Lenz's law;

3. According to the law of the direction of the magnetic field generated by the loop current inside the loop (right-hand spiral law, the direction of the induced current is determined by the direction of the magnetic flux of the induced current.

Taking the force formulation as an example, the main point is the ampere force experienced by the induced current in a magnetic field.

direction, always at an obtuse angle to the direction of the conductor's motion, thus hindering the movement of the conductor Therefore, the procedure to apply it to determine the induced current is:

1. Clarify the direction of the magnetic field b and the direction of the conductor's motion;

2. According to the above meaning of Lenz's law.

Determine the direction of the ampere force on the induced current;

3. Determine the direction of the induced current according to the law of ampere force.

The expansion is suitable for the magnet to pass through the closed coil, not for the energized solenoid to pass through the closed coil.

Because when the ring is on the energized solenoid, there is a positive magnetic flux and a negative magnetic flux through the ring, so the net magnetic flux should be calculated, when the magnetic flux increases, the magnetic flux in the tube increases, if the ring shrinks again, then the reverse magnetic flux is less, the net magnetic flux is more, and the hindrance effect is achieved, so it is necessary to expand, and the magnetic flux outside the tube is more encircled in the ring, so that the increased magnetic flux in the tube is reduced to achieve the obstruction effect.

This is due to the fact that there is a magnetic field inside and outside the spiral tube, and the opposite direction is partially canceled out.

Increase, contraction, expansion in physics, is Lenz's law.

The conditions are as follows: 1. The direction of the original magnetic flux passing through the loop, and whether it increases or decreases;

2. Determine the direction of the magnetic flux generated by the induced current in the loop according to the above meaning expressed in Lenz's law;

3. According to the law of the direction of the magnetic field generated by the loop current inside the loop (right-hand spiral law, the direction of the induced current is determined by the direction of the magnetic flux of the induced current.

Taking the force formulation as an example, the gist of it is that the direction of the ampere force experienced by the induced current in the magnetic field is always obtuse at an obtuse angle to the direction of the conductor's motion, thus hindering the movement of the conductor Therefore, the procedure for applying it to determine the induced current is:

1. Clarify the direction of the magnetic field b and the direction of the conductor's motion;

2. According to the above meaning of Lenz's law, clarify the direction of the induced current by ampere;

3. Determine the direction of the induced current according to the law of ampere force.