A flexible conducting wire in the form o...

A flexible conducting wire in the form of a circle is kept in a uniform magnetic field with its plane normal to the field. Radius of that circle changes with time as shown. Then which of the following graphs represents the variation of induction emf with time `R = R_(0), t lt t_(0) , R = R_(0) + t, t_(0) lt t lt 2t_(0)`:

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