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Electricity and Magnetism Level 2

What will be the energy stored in an isolated parallel plate capacitor, if the separation between their plates is doubled?

Doubled Quarter Quadrupled Half

1 solution

Gagan Raj
Mar 18, 2015

$Capacitance$ $=$ $C$ $=$ $\frac{\epsilon\ A}{d}$ . As $d$ is doubled we get the value of capacitance to be halved.

$Capacitor~Energy$ $=$ $U$ $=$ $\frac{1}{2}$ $\frac{Q^{2}}{C}$

Here , the halved capacitance value is substituted and hence we get the answer as the $Capacitance~Energy$ is doubled.

It isn't clear in the question whether the capacitor is connected to a source, or is isolated. After all the answer depends on that.

Utkarsh Singh - 6 years, 2 months ago