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A metal rod of length L rotates about one end at origin with a uniform angular velocity ω. The magnetic field radially f…

Q1

A metal rod of length L rotates about one end at origin with a uniform angular velocity ω. The magnetic field radially falls off as \(\mathrm{B}(\mathrm{r})={\mathrm{B}}_{∘}{\mathrm{e}}^{-\lambda \mathrm{r}};\lambda\) being a positive constant. The induced emf (neglecting centripetal force on electrons in the rod) is:

[JEE Main 2026, 5 Apr (Shift 2)]

a

\({B}_{o}\omega \left[\frac{1}{{\lambda }^{2}}-{e}^{-\lambda L}\left(\frac{1}{{\lambda }^{2}}+\frac{L}{\lambda }\right)\right]\)

b

\({B}_{o}\omega \left[\frac{1}{{\lambda }^{2}}+{e}^{-\lambda L}\left(\frac{1}{{\lambda }^{2}}+\frac{L}{\lambda }\right)\right]\)

c

\({B}_{o}\omega \left[\frac{4}{{\lambda }^{2}}-{e}^{-2\lambda L}\left(\frac{1}{{\lambda }^{2}}+\frac{2L}{\lambda }\right)\right]\)

d

\({B}_{o}\omega \left[\frac{3}{{\lambda }^{2}}-{e}^{-3\lambda L}\left(\frac{3}{{\lambda }^{2}}+\frac{L}{\lambda }\right)\right]\)

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