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MHT CET20227 Aug 2022Morning ShiftPhysicsElectromagnetic InductionActual

A coil having effective area ' A ' is held with its plane normal to a magnetic field of induction ' B '. The magnetic induction is quickly reduced to 25 % of its initial value in 1 second. The e.m.f. induced in the coil (in volt) will be

Options

  1. AAB 2
  2. B3 AB 4
  3. CAB 4
  4. D3 AB 8

Correct answer

B. 3 AB 4

Step-by-step solution

Induced emf is equal to change in flux per unit time: aligned & e = d dt = A dB dt = A 3 4 B 1 & ( dB = 3 4 ~B ) & E = 3 AB 4 ~V aligned

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