A capacitor C, a variable resistance R and a bulb are connected in series to a.c. mains in the circuit as shown. The bulb glows with some brightness. How the glow of the bulb change if.

A dielectric slab is introduced between the plates of the capacitor.

Explanation

The brightness of bulb increases (When dielectric slab is introduced, capacitance increases hence capacitive reactance decreases, then bulb glows with more brightness.)