Question

Derive the expression for induced emf produced by changing m area of rectangular coil placed in perpendicular magnetic field

Answer 1

Induced emf=ΔФ/t

⇒ΔФ=change in flux

⇒t= time

flux changed=BAn

    ⇒where n = no.of coil

        n=1

        ΔA=change in area in the time period Δt

Now, induced emf=(B*ΔA)/Δt

The expression for induced emf produced by changing area of rectangular coil placed in perpendicular magnetic field is,

induced emf=B(A2-A1)/Δt

                    =(BΔA)/Δt