Question

The energy required to charge a parallel plate condenser of plate separation d and plate area of cross-section A such that the uniform electric field between the plates is E, is

• A. $\frac{1}{2} \varepsilon_0 E^2 \, Ad$
• B. $\frac{1}{2} \varepsilon_0 E^2 / Ad$
• C. $\varepsilon_0 E^2 / Ad$
• D. $\varepsilon_0 E^2 \, Ad$

Answer 1

Answer: (C)

$\varepsilon_0 E^2 / Ad$

Answer 2

Energy required = $\frac{1}{2} CV^2 = \frac{1}{2} \varepsilon_0 E^2 \, Ad$