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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
IntermediateMCQConceptual17.7k
A diagram shows a rectangular wire loop moving to the right with a velocity vector arrow labeled v. To the right of the loop is a rectangular region filled with evenly spaced 'X' symbols, representing a uniform magnetic field B directed into the page. The loop is partially inside this region, with its right vertical side already within the field and its left vertical side still outside the field.
A rectangular loop entering a uniform magnetic field directed into the page.
A rectangular conducting loop of wire is moving with a constant velocity \(v\) to the right. It is currently entering a region of space containing a uniform magnetic field \(\vec{B}\) that is directed into the page, as shown in the figure. Which of the following correctly describes the direction of the induced current in the loop and the physical justification while the loop is still entering the region?

DirectionJustification
(A) CounterclockwiseThe magnetic flux into the page is increasing, so the induced field must be out of the page.
(B) ClockwiseThe magnetic flux into the page is increasing, so the induced field must be into the page.
(C) CounterclockwiseThe magnetic flux out of the page is decreasing, so the induced field must be out of the page.
(D) ZeroThe velocity is constant, so there is no change in magnetic flux through the loop.

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