The figure shows four different situations in which a metal ring moves to the ri

Question

The figure shows four different situations in which a metal ring moves to the right with constant speed through a region with a varying magnetic field. The intensity of the color indicates the intensity of the field, and in each case the field either increases or decreases at a uniform rate from the left edge of the colored region to the right edge. The direction of the field in each region is indicated.

A) For the first case, state whether the induced emf is clockwise, counterclockwise, or zero.

B)For the second case, state whether the induced emf is clockwise, counterclockwise, or zero.

C) For the third case, state whether the induced emf is clockwise, counterclockwise, or zero.

D) For the fourth case, state whether the induced emf is clockwise, counterclockwise, or zero.

Explanation / Answer

1) Note: Out of page is decreasing--compensate by more out of page. Induced EMF or current--counter clockwise. 2)Note: Top half is out of the page and decreasing--compensate by more out of page Bottom half is out of page and increasing--compensate by less out of page. Magnitudes seem to be equal. Induced EMF or current--0 3) Note: In to page is lessening--compensate by more into page Out of page is lessening--compensate by more out of page. Magnitudes of both are equal. This gives a net of 0 Induced EMF or current--0 4) Note: Into page is lessening--to compensate need more into page Out of page is increasing--to compensate need less out of page (more into page). Net: need more into page Induced EMF or current--clockwise.

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