Which one of the following gives the magnitude of the induced EMF in a coil of turns…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Which one of the following gives the magnitude of the induced EMF

\varepsilon

in a coil of

N

turns when the magnetic flux through it changes at the rate

d\Phi/dt

? (a)

\varepsilon = -N\,\dfrac{d\Phi}{dt}

(b)

\varepsilon = N\,\dfrac{\Phi}{dt}

(c)

\varepsilon = N\,\dfrac{d\Phi}{dt}

(d)

\varepsilon = \dfrac{1}{N}\,\dfrac{d\Phi}{dt}