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When a small piece of wire passes between the magnetic poles of a horse-shoe magnet in 0.1 sec, emf of `4 xx 10^(–3)` volt is induced in it. The magnetic flux between the poles is :

A

`4xx10^(-2)` weber

B

`4xx10^(-3)` weber

C

`4xx10^(-4)` weber

D

`4xx10^(-6)` weber

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