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Alternating Current

Easy Questions

Electricity and Magnetism

Current Electricity
Moving Charges and Magnetism
Magnetism and Matter
Electromagnetic Induction
Alternating Current
Electromagnetic Waves
  1. A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when​​
    1. number of turns in the coil is reduced
    2. a capacitance of reactance Xc = XL is included in the same circuit
    3. an iron rod is inserted in the coil
    4. frequency of the Ac source is decreased
Correct Option: C

​By inserting iron rod in the coil, ​L ↑ z ↑ I ↓ so brightness ↓


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