Q. A capacitor connected to a 10 V battery collects a charge of 40 $\mu$C with air as dielectric and 100 $\mu$C with a given oil as dielectric. The dielectric constant of the oil is
A) 1.5
B) 2.0
C) 2.5
D) 3.0
Explanation
(c) $Q = CV.As\ V\ is\ constant,\ therefore,\ Q \propto C$
Hence, $C\ $becomes $\ \frac{100}{40} = 2.5\ times$
$\therefore\ K = 2.5$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.