Q. If a slab of insulating material $4 \times 10^{- 3}m$ thick is introduced between the plates of a parallel plate capacitor, the separation between plates has to be increased by $3.5 \times 10^{- 3}m$ to restore the capacity to original value. The dielectric constant of the material will be

A) 6
B) 8
C) 10
D) 12
Explanation

(b) $K = \frac{t}{t - d'} = \frac{4 \times 10^{- 3}}{4 \times 10^{- 3} - 3.5 \times 10^{- 3}} = 8$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.