Could someone please explain this. I know the answer for 1= C and 2= C as well.

Question

Could someone please explain this. I know the answer for 1= C and 2= C as well. I just need the background behind how they got those answers

01. Consider a magnet that moves upward with an initial velocity v. What will be the direction of the induced current (i) when the N-pole of the magnet enters the ring; (ii) when the S-pole of the magnet leaves the ring? Exercise A. (i) clockwise, (ii) clockwise B. (i) counter-clockwise, (ii) clockwise C. (i) clockwise, (ii) counter-clockwise V D. (i) counter-clockwise, (i) counter-clockwise E. No current ***The direction of the current when you looks down from the top of the ring Q2. Which of the following correctly describe the velocity of the magnet as it enters and then leaves the ring? (Hint: Lenz's Law) A. v decrease when magnet enters the ring, then v increase when magnet leaves the ring. B. v increase when magnet enters the ring, then v decrease when magnet leaves the ring. C. v decrease when magnet enters & leaves the ring. D. v increase when magnet enters & leaves the ring.

Explanation / Answer

Q1

i)

due to the magnet, the magnetic field through the coil is in in upward direction. As the magnetic's north end moves toward the coil closer, the magnetic flux linked with the coil increase. The coil tries to oppose this change in magnetic field by inducing a current in itself so as to produce magnetic field in opposite direction of the external magnetic field. external magnetic field is upward , so the magnetic field by coil has to be in down direction. for a downward magnetic field , the coil induces current in clockwise direction

ii)

due to the magnet, the magnetic field through the coil is in in upward direction. As the magnetic'a south end moves away from the coil r, the magnetic flux linked with the coil decrease. The coil tries to oppose this change in magnetic field by inducing a current in itself so as to produce magnetic field in same direction of the external magnetic field. external magnetic field is upward , so the magnetic field by coil has to be in upward direction. for a upward magnetic field , the coil induces current in counter-clockwise direction.

C.

As the magnet moves toward the ring , the ring induces current and produce it own magnetic field to oppose the motion of the magnet towards it.

As the magnet moves away from the ring , the ring induces current and produce it own magnetic field to oppose the motion of the magnet away from it.

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