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A circular coil of radius 0.140 m contains a single turn and is located in a...

A circular coil of radius 0.140 m contains a single turn and is located in a constant magnetic field of magnitude 0.250 T. The magnetic field has the same direction as the normal to the plane of the coil. The radius increases to 0.290 m in a time of 0.0850 s. (a) Determine the magnitude of the emf induced in the coil. (b) The coil has a resistance of 0.670 Ω. Find the magnitude of the induced current.

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