An air core coil and an electric bulb are connected in series with an AC source. If an iron rod is put in the coil, then the intensity of light of the bulb will

Options

(a) remain same
(b) increase
(c) decrease
(d) first decrease then increase

Correct Answer:

decrease

Explanation:

If an iron rod is puts in the coil, then intensity of light of bulb will decrease because the iron rod increase the resistance.