A conducting ring of radius 1 m is placed in a uniform magnetic field B of 0.01 T oscillating with frequency 100 Hz with its plane at right angle to B. What will be the induced electric field?

From Faraday's law of electromagnetic induction, the induced emf is equal to negative rate of change of magnetic flux.That is e=−ΔϕΔtFlux induced =2BA cosθwhere B is magnetic field, A is area. Given, θ=0∘, Δt=1100 sΔϕ=2×0.01×π×(1)2×200×cos0∘∴ e=−2×0.01×π×(1)2×200100=−4π volt Circumference of a circle of radius r  is  2 πr. ∴   Induced electric field E isE=|e|2πr=4π2πr=21=2V/m