As shown below, a square loop of wire of side a moves through a uniform magnetic field of magnitude B perpendicular to the page at constant velocity 
directed to the right. Which statement regarding the electric field induced in the wires is correct for the wires at the left and right sides of the loop?
?
?
A.
is directed upwards in both the right and left sides of the loop.B.
is directed upwards in the right side and downwards in the left side of the loop.C.
is directed upwards in the left side and downwards in the right side of the loop.D.
is directed downwards in both the right and left sides of the loop.E.
Answer: D
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