Questions
A parallel plate capacitor has plates of area A and separation d and is charged to a potential difference V. The charging battery is then disconnected and the plates are pulled apart until their separation is 2d. What is the work required to separate the plates?
detailed solution
Correct option is D
W=U2−U1=q221C2−1C1C1=ε0Ad,C2=C12=ε0A2dq=C1V=ε0AVd⇒W=12ε0AV2dAlternatively,W=Fd=Q22Aε0d=C12V22ε0Ad=12ε0AV2dTalk to our academic expert!
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