JEE Main & Advanced
Physics
Electrostatics & Capacitance
Question Bank
Capacitance
question_answer
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 [MNR 1998; KCET 2005]
A) 2
B) 4
C) 6
D) 8
Correct Answer:
B
Solution :
\[C=\frac{{{\varepsilon }_{0}}A}{d}=1pF\] and \[C'=\frac{K{{\varepsilon }_{0}}A}{2d}=2pF\] \ K = 4.