Which one of the following expressions gives the instantaneous emf induced in a…

PHYSICS · Single correct · CBSE · Physics · Electromagnetic Induction · Electromagnetic Induction

Problem

Which one of the following expressions gives the instantaneous emf

ε

induced in a secondary coil when the current

I

in a nearby primary coil changes at a rate

\frac{dI}{dt}

? (a)

ε = -N\dfrac{dΦ}{dt}

(b)

ε = +M\dfrac{dI}{dt}

(c)

ε = -M\dfrac{dI}{dt}

(d)

ε = -L\dfrac{dI}{dt}