PLEASE EXPLAIN ANSWER The figure shows two metal disks of the same size and mate

Question

PLEASE EXPLAIN ANSWER

The figure shows two metal disks of the same size and material oscillating in and out of a region with a magnetic field. One disk is solid; the other has a series of slots.
Part A:Is the retarding effect of eddy currents on the solid disk greater than, less than, or equal to the retarding effect on the slotted disk?
Part B:Choose the best explanation from among the following:

A:The disks are the same size and made of the same material; therefore, they experience the same retarding force.

B:The slotted disk experiences the greater retarding force because the slots allow more magnetic field to penetrate the disk.

C:The solid disk experiences a greater retarding force because eddy currents in it flow freely and are not interrupted by the slots

PLEASE EXPLAIN ANSWER

Explanation / Answer

Part A) When magnetic field changes through the disk, induced current produces and if slots are present in the disk will suppress these induced currents clockwise and anti-clockwise.So decreasing induced currents through the disk will result in decreasing magnetic field. Hence we can conclude that retarding effect of eddy currents will be greater on solid disk than on slotted disk

Part B) Best explanation is ( c) : the solid disk experiences a greater retarding force because eddy currents in it flow freely and are no interrupted by the slots.

( b ) : statement is not correct as field penetration through disk is not affected by slots.

( a ) : statement is also not correct because it doesnt explain the effect of eddy currents on motion of disk.

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