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A total charge of 5times10^(-4)C passes ...

A total charge of `5times10^(-4)`C passes through a 100 turn coil of resistance `200Omega` ,cross-sectional area `40cm^(2)` when it is rotated in a uniform field from a position where the plane of the coil is perpendicular to the field to a position where the coil's plane is parallel to the field.Calculate B in millitesla.

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