The sketches below show a circular coil and a permanent magnet; the arrows indic

Question

The sketches below show a circular coil and a permanent magnet; the arrows indicate both the magnitude and the direction of the velocities of the magnet and coil. For each situations, determine the direction of the induced current in the loop as viewed from the left. CW CCW no induced current CW CW First determine if the (magnetic) flux through the loop is increasing, decreasing or unchanged. (Flux is magnetic field times area times the cosine of the angle between B and the normal to the area.) (1) If the flux is increasing, then the induced current produces a field that is opposite in direction to the field by the bar magnet. (2) If the flux is decreasing, then the induced current produces a field that is in the same direction to the field by the bar magnet. (3) If the flux is not changing, then there is no induced current. Use the right hand rule (current and magnetic field) to determine the direction of the induced current. See the following animation. Submit Answer Incorrect. Tries 1/15 Previous Tries

Explanation / Answer

Note: ccw current in coil generates a north pole in it while cw current generates a south pole.

1) No current ( the magnet and the coil are moving with same velocity, so no flux change)

2) ccw (Magnet is moving away faster, flux is reducing. So, the coil will try to bring the magnet towards itself, so it will attract. For that it needs to induce a north pole in it since south pole of the magnet if facing it. Hence the direction is ccw.)

Based on similar explanation, we have the remaining:

3) cw

4) No current

5) cw

6) cw

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