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 de-Broglie wavelength of neutron in thermal equilibrium at temperature T is
  2. Two point charges +2 coulomb and +10 coulomb repel each other with a force of 12 N.
  3. When a beam of light is used to determine the position of an object,
  4. A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof
  5. The radius of orbit of a planet is two times that of the earth. The time period