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MHT CET202520 Apr 2025Morning ShiftPhysicsElectromagnetic InductionActual

The current flowing through an inductor of self-inductance L is continuously increasing at constant rate. The variation of induced e.m.f. (e) verses dI / dt is shown graphically by figure

Options

  1. AB
  2. BA
  3. CD
  4. DC

Correct answer

B. A

Step-by-step solution

The induced electromotive force (e.m.f.) in an inductor is given by Faraday's law: e = -L dI dt where L is the self-inductance (a positive constant) and dI dt is the rate of change of current. The equation indicates a linear relationship where the e.m.f. is proportional to the rate of current change. The negative sign reflects Lenz's law: the induced e.m.f. opposes changes in current. When dI dt > 0 , the e.m.f. is negative; when dI dt The graph of e versus dI dt must be a straight line through the origin with nega

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