$7)$ An elastic conducting material is stretched into a circular loop of $11\mathrm{.}2$ cm radius. It is placed with its plane perpendicular to a uniform $0\mathrm{.}793$ T magnetic field. When released, the radius of the loop starts to shrink at an instantaneous rate of $78\mathrm{.}6c\frac{m}{s}.$ What emf is induced in volts in the loop at that instant?

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