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NEET 2019 · Rotating Conductors & AC Generator

Rotating Conductors & AC Generator question from NEET 2019

Q30NEET 2019Easy

Rotating Conductors & AC Generator

A cycle wheel of radius 0.5 m is rotated with constant angular velocity of 10 rad/s in a region of magnetic field of 0.1 T which is perpendicular to the plane of the wheel. The EMF generated between its centre and the rim is,

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Answer: (c)

  1. Each spoke is a rod rotating about one end; spokes are in parallel, so the emf is that of one spoke.
  2. e=12Bωr2=12×0.1×10×(0.5)2e = \tfrac{1}{2}B\omega r^2 = \tfrac{1}{2} \times 0.1 \times 10 \times (0.5)^2
  3. e=0.125 Ve = 0.125\text{ V}, so the answer is (c).
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