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 direcion of the induced current in the loop as viewed from the right.

Hint: 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.

Explanation / Answer

1. as south pole is coming close, the face of coil facing the eye will become north pole

hence CCW current

North pole is coming closer, the other face of coil becomes south pole

CW current

North polse is coming closer

CW current

South pole ic soming closer, but flux chaang eis 0 because of orientation of the coil

No current

No relative motion between coil and magnet

No current

South pole is coming closer

CCW current

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