I don\'t want to know correct answer. I want to know the idea behind this questi

Question

I don't want to know correct answer. I want to know the idea behind this question. Please explain. Thanks.

A long straight wire is in the plane of a rectangular conducting loop. The straight wire carries a constant current i, as shown. While the wire is being moved toward the rectangle the current in the rectangle is: 14. A. zero B. clockwise C. counterclockwise D. clockwise in the left side and counterclockwise in the right side E. counterclockwise in the left side and clockwise in the right side

Explanation / Answer

C. Counterclockwise.

For the straight wire carrying current I in the upward direction on the plane of paper,the magnetic field due to this current is going inward the page in the loop.As the wire move towards the rectangular loop,the magnetic flux through the loop will increase,which will induce a non-zero emf in the loop.To counteract this increase in magnetic flux,a current starts flowing to create a counteracting magnetic flux through the loop.As the magnetic field points into the page,the counteracting magnetic field of the loop must point out of the page.This requires a counterclockwise current.

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