Question

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

• A. Frequency of the AC source is decreased
• B. Number of turns in the coil is reduced
• C. A capacitance of reactance $X_c= X_L$, is included in the same circuit
• D. An iron rod is inserted in the coil

Answer 1

Answer: (D)

An iron rod is inserted in the coil

Answer 2

The correct option is (D): An iron rod is inserted in the coil