Question

A dielectric slab is inserted between the plates of an isolated capacitor. The force between the plates will

• A. increase
• B. decrease
• C. remain unchanged
• D. become zero

Answer 1

Answer: (C)

remain unchanged

The force between the plates is given by

$F=\frac{q^2}{2{ϵ}_{0}A}$

An isolated capacitor has the same charge present on its plates and it does not change. Therefore, the force between the plates also remains the same.

So, the force remains unchanged.