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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:
A$Bv/\ell$
B$B\ell v$
C$B/(\ell v)$
D$B\ell/v$
Answer & Solution
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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