KEAM Motional EMF — practice questions

Explore 2 free Motional EMF questions in KEAM Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Motional EMF questions and exercises with answers

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The motional EMF induced in a conductor of length $\ell$ moving with velocity $v$ perpendicular to a uniform magnetic field $B$ is:Read the answer and worked solution →A conducting rod of length 1 m moves with velocity 5 m/s perpendicular to a uniform magnetic field of 0.4 T. The motional EMF is:Read the answer and worked solution →

Worked practice questions

The motional EMF induced in a conductor of length $\ell$ moving with velocity $v$ perpendicular to a uniform magnetic field $B$ is:

$Bv/\ell$
$B\ell v$
$B/(\ell v)$
$B\ell/v$

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Correct answer: B. $B\ell v$

When a straight conductor of length $\ell$ moves perpendicular to $B$ with speed $v$, the rate of flux change is $B\ell v$, so $|e| = B\ell v$.

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A conducting rod of length 1 m moves with velocity 5 m/s perpendicular to a uniform magnetic field of 0.4 T. The motional EMF is:

2.0 V
1.0 V
0.5 V
10 V

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Correct answer: A. 2.0 V

$|e| = B\ell v = 0.4 \times 1 \times 5 = 2.0$ V.