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Question: There is an air-filled 1pF parallel plate capacitor. When the plate separation is doubled and the sp...

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 2 pF. The dielectric constant of wax is-

A

2

B

4

C

6

D

8

Answer

4

Explanation

Solution

1PF = ε0 A d\frac { \varepsilon _ { 0 } \mathrm {~A} } { \mathrm {~d} } ; 2PF = ε0KA2 d\frac { \varepsilon _ { 0 } \mathrm { KA } } { 2 \mathrm {~d} }