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The armature of a demonstrator generator consists of a flat square coil of side 4cm and 200 turns. The coil rotates in a magnetic field of 0.75 T. The angular speed so that a maximum emf of 1.6V is generated is

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None of these

$\frac{20}{3} rotations/s$

$\frac{20}{3} rpm$

$\frac{20}{3} rad/s$

answer is A.

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Detailed Solution

$ε_{\max} = N A_{0} B ω$

$ω = \frac{ε_{\max}}{N A_{0} B}$

$= \frac{1.6}{200 \times 16 \times 10^{- 4} (0.75)}$

$= \frac{20}{3} r a d / s$

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