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AP EAMCET202017 Sep 2020Morning ShiftPhysicsElectromagnetic InductionActual

The current in a coil changes from (3 ~A ) to (1 ~A ) in (0.1 ~s ) in a coil of self-inductance (8 mH ). The emf induced in the coil is

Options

  1. A(16 ~V )
  2. B(1.6 10⁻² ~V )
  3. C(16 10⁻² ~V )
  4. D(2 ~V )

Correct answer

C. (16 10⁻² ~V )

Step-by-step solution

Change in currents in the coil ( I=(3-1) A =2 ~A ) Time interval, ( t=0.1 ~s ) Self induction, (L=8 mH =8 10⁻³ H ) ( ) Induced emf in the coil, (e=L d I d t =L I t =8 10⁻³ 2 0.1 =16 10⁻² ~V )

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