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MHT CET202123 Sep 2021Morning ShiftPhysicsElectromagnetic InductionActual

A coil has an area 0.06 ~m ^2 and it has 600 turns. After placing the coil in a magnetic field of strength 5 10⁻⁵ Wbm ⁻² , it is rotated through 90^ in 0.2 second. The magnitude of average e.m.f induced in the coil is

Options

  1. A12 10⁻³ ~V
  2. B3 mV
  3. C3 ~V
  4. D9 10⁻³ ~V

Correct answer

D. 9 10⁻³ ~V

Step-by-step solution

Induced emf, e = - N ( ₂- ₁ ) t = - NBA ( ₂- ₁ ) t Assuming that the coil was initially placed perpendicular magnetic flux aligned & ₁=0^ and ₂=90^ . & e = - NBA ( 90^ - 0^ ) t & = - NBA (0-1) t = NBA t & = 600 5 10⁻⁵ 0.06 0.2 =9 10⁻³ ~V aligned

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