Q. 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 Xc = XL in included.
  • (D) an iron rod is inserted in the coil.
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✅ Correct Answer: (D) an iron rod is inserted in the coil.

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