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MHT CET20244 May 2024Evening ShiftPhysicsElectromagnetic InductionActual

A coil of self inductance L is connected in series with a bulb B and an a.c. source. Brightness of the bulb decreases when

Options

  1. Afrequency of a.c. source is decreased.
  2. Bnumber of turns in the coil is reduced.
  3. Ca capacitance of reactance (X_L-X_C ) is included in the same circuit.
  4. Dan iron rod is inserted in the coil.

Correct answer

D. an iron rod is inserted in the coil.

Step-by-step solution

When iron rod is inserted, the coil magnetizes the iron rod increasing the magnetic field. Inductance (L) of coil increases. V = L di dt Voltage drop across the coil increases i.e. voltage drop at bulb decreases. Brightness of bulb decreases.

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