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BITSAT2010PhysicsElectromagnetic InductionActual

The back emf induced in a coil, when current changes from 1 ampere to zero in one milli-second, is 4 volts, the self inductance of the coil is

Options

  1. A1 henry
  2. B4 henry
  3. C10⁻³ henry
  4. D4 10⁻³ henry

Correct answer

D. 4 10⁻³ henry

Step-by-step solution

e =- L di dt But e =4 ~V and di dt = 0-1 10⁻³ =-1 / 10⁻³ -1 10⁻³ (- L )=4 L =4 10⁻³ henry

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