Question

how will the capacitance of a capacitor change when a dielectric slab is introduced between the plates of a capacitor

Answer 1

When a dielectric slab is introduced between the plates of the capacitor, itscapacitance will increase. Hence, the potential drop across the capacitor willdecrease (V= Q/C ) thereby decreasing the potential drop across the bulb because, both the bulb and capacitoris connected in series.