Question 672: Electrostatics & Capacitance

Question

$$ 	ext { A } 2 \mu \mathrm{~F} 	ext { capacitor is charged as shown, } $$
When switch $S$ is shifted to position $2, \%$ of energy lost is

Accepted Answer

$U_1=\frac{q^2}{4}$ and $U_2=\frac{q^2}{20}$
Ã¢ÂÂ´ Energy dissipated
$$ \begin{aligned} & =\frac{U_1-U_2}{U_1} 	imes 100 \ & =\frac{\frac{q^2}{4}-\frac{q^2}{20}}{\frac{q^2}{4}}=\frac{4}{5} 	imes 100 \ & =80 \% \end{aligned} $$

Answer

$0 \%$

Answer

$20 \%$

Answer

$75 \%$

Answer

$80 \%$

Electrostatics & Capacitance

\text { A } 2 \mu \mathrm{~F} \text { capacitor is charged as shown, } When switch S is shifted to position 2, \%$ of energy lost is

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