The capacity of a parallel plate condenser is 10μF when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm then the capacity of this parallel plate condenser will be ?
(a) 5μF
(b) 10μF
(c) 20μF
(d) 40μF
Answer : (c) 20μF
\( C = \frac{\varepsilon_0 A}{d} \)
\( 10\,\mu\text{F} = \frac{\varepsilon_0 A}{8\, \text{cm}} \)
\( C_2 = \frac{\varepsilon_0 A}{4\, \text{cm}} \)
\( C_2 = 20\,\mu\text{F} \)
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