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A wheel with 20 metallic spokes each \( 1 \mathrm{~m} \) long is rotated with a speed of 120 rpm in a plane perpendicula…

Q1

A wheel with 20 metallic spokes each \( 1 \mathrm{~m} \) long is rotated with a speed of 120 rpm in a plane perpendicular to a magnetic field of \( 0.4 \mathrm{G} \). The induced emf between the axle and rim of the wheel will be. \((1G={10}^{-4}T)\)

a

\( 2.51 \times 10^{-5} \mathrm{~V} \)

b

\( 4.0 \times 10^{-5} \mathrm{~V} \)

c

\( 2.51 \mathrm{~V} \)

d

\( 2.51 \times 10^{-4} \mathrm{~V} \)

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