In the Figure,a Straight Wire Carries a Steady Current I

In the figure,a straight wire carries a steady current I perpendicular to the plane of the page.A bar is in contact with a pair of circular rails,and rotates about the straight wire.The direction of the induced current through the resistor R is

A) from a to b.
B) from b to a.
C) There is no induced current through the resistor.

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