Q. There is an air filled $1pF$ parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to $2pF$. The dielectric constant of wax is
A) 2
B) 4
C) 6
D) 8
Explanation
(b) $C = \frac{\varepsilon_{0}A}{d} = 1\ pF$ and $C^{'} = \frac{K\varepsilon_{0}A}{2d} = 2pF\ \therefore K = 4$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.