A coil having an area $2{\mkern 1mu} \,{\mkern 1mu} {m^2}$ is placed in a magnetic field which changes from $1\,\,wb/{m^2}$ to $4\,\,wb/{m^2}$ in an interval of 2 second. The average e.m.f. induced in the coil will be

JEE PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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Application +4 | -1

A coil having an area

2{\mkern 1mu} \,{\mkern 1mu} {m^2}

is placed in a magnetic field which changes from

1\,\,wb/{m^2}

4\,\,wb/{m^2}

in an interval of 2 second. The average e.m.f. induced in the coil will be

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Correct option: B

3 V

Option B (3 V) is correct because the average induced emf is calculated using Faraday's law of induction.

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R

n

i=i_0 \sin \omega t

N

4 \mathrm{sec}

0.1\,\,{m^2}

\mathrm{60}

\mathrm{0}\mathrm{.4}\,\,\mathrm{T}

\mathrm{100}

\mathrm{50}\,\,\mathrm{mH}

\mathrm{2 A}