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An elasticized conducting band is around...

An elasticized conducting band is around a spherical ballon . Its plane through the center of the balloon. A uniform nmagnetic field of magnitude `0.04T` is directed perpendicular to the plane of the band. Air is let out of the balloon at `100 cm^(3) s^(-1)` at an instant when the radius of the balloon is `10 cm`. The induced emf in the band is

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