A metallic rod of length \( \mathrm{l} \) is tied to a string of length 21 and made to rotate ...

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A metallic rod of length \( \mathrm{l} \) is tied to a string of length 21 and made to rotate with angular speed \( \omega \)
\( \mathrm{P} \)
on a horizontal table with one end of the string
W
fixed. If there is a vertical magnetic field \( \mathrm{B} \) in the region, the e.m.f. induced across the ends of the rod is
(1) \( \frac{3 B \omega l^{2}}{2} \)
(2) \( \frac{4 B \omega l^{2}}{2} \)
(3) \( \frac{5 B \omega l^{2}}{2} \)
(4) \( \frac{2 B \omega l^{2}}{2} \)
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