Navigate

A coil of self-inductance L is connected in series with a bulb B and an AC source

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

Options

(a) number of turns in the coil is reduced
(b) a capacitance of reactance Xc = Xl is included in the same circuit
(c) an iron rod is inserted in the coil
(d) frequency of the AC source is decreased

Correct Answer:

an iron rod is inserted in the coil

Explanation:

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

NEET2013
admin:

Related Questions

  1. The initial rate of increase of current, when a battery of emf 6 V is connected
  2. When a p-n junction is reverse biased, then the current through the junction
  3. Consider a uniform square plate of side ɑ and mass m. The moment of inertia
  4. A ball moving with velocity 2 m/s collides head on with another stationary ball
  5. 6Ω and 12Ω resistors are connected in parallel. This combination is connected