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A square frame of side 10 cm along straight wire carrying current 1 A are in the plane of the paper . Starting from close to the wire , the frame moves towards the right with a constant speed of $\;10\;ms^{-1}\;$ (see figure) .The e.m.f. induced at the time the left arm of the frame is at x=10 cm from the wire is :

$(a)\;2\;\mu V\qquad(b)\;1\;\mu V\qquad(c)\;0.75\;\mu V\qquad(d)\;0.5\;\mu V$

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