changing a magnetic field B induces an emf ϵ in a coil of radius R. What is the induced emf in the coil of radius 2R?
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it will be 4 € , bcoz emf is directly proportional to rate of change of magnetic flux.. and magnetic flux is given by B.A , .. and area is proportional to square of radius.. so emf will increase by 2^2 i.e 4 times.. hope it helps..if any doubt plz ask.
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