Question

The capacity of a parallel plate condenser is . Its capacity when the separation between the plates is halved will be

• A.
• B.
• C. $\frac { C } { 2 }$
• D. $\frac { C } { 4 }$

Answer 1

Answer: (B)

Answer 2

$C = \frac { \varepsilon _ { 0 } A } { d } \cdot C ^ { \prime } = \frac { \varepsilon _ { 0 } A } { d / 2 }$ ⇒ $C ^ { \prime } = 2 C$