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JEE Main20246 Apr 2024Evening ShiftPhysicsElectromagnetic InductionActual

In a coil, the current changes from -2 ~A to +2 ~A in 0.2 ~s and induces an emf of 0.1 ~V . The self inductance of the coil is :

Options

  1. A4 mH
  2. B1 mH
  3. C5 mH
  4. D2.5 mH

Correct answer

C. 5 mH

Step-by-step solution

(E m f)_ induced =-L d i d t In magnitude form, aligned & | Emf _ ind |= |(-) L di dt | & 0.1= ( L )[+2-(-2)] 0.2 & L = 0.1 0.2 4 =5 mH aligned

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