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A U - shaped conducting frame is fixed i...

A U - shaped conducting frame is fixed in space. A conducting rod CD lies at rest on the smooth frame as shown. The frame is in a uniform magnetic field `B_0` which is perpendicular to be plane of the frame . At the time t = 0 , the magnitude of the magnetic field being to change with time t as, `B =B_0/(1+kt)` , where k is a positive constant . For no current to be ever induced in the frame the speed with which rod should be pulled starting from time t = 0 is (the rod CD should be moved such that its velocity must lie in the plane of frame and perpendicular to rod (CD)

A

ak

B

bk

C

`a(1+kt)`

D

`b(1+kt)`

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The correct Answer is:
A
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