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Question


A square frame with side length l has total resistance R. It is being pulled with speed v out of region of uniform magnetic field B. Moment when left corner is at distance x inside field, the force required to pull frame at constant speed v is

A
4B2x2vR
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B
2B2x2v2R
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C
3B2x2v2R
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D
2B2x2vR
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Solution

The correct option is A 4B2x2vR

ε=B v lAB
i=εR=B v lABR
F=i lAB B=B2 v l2ABR
As, x=lAB2

We get,
F=B2 v 4x2R

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