Physics

Problem

A single circular loop of fixed area

A

is kept with its plane perpendicular to a uniform magnetic field

B

. If the field changes at the rate

\dfrac{dB}{dt}

, which one of the following expressions gives the magnitude of induced emf

|\mathcal{E}|

in a coil of

N

turns? a)

A\dfrac{dB}{dt}

NA\dfrac{dB}{dt}

NB\dfrac{dA}{dt}

\dfrac{A}{N}\dfrac{dB}{dt}