$C_1=10\mathrm{.}6F,C_2=7\mathrm{.}7F,$ and $C_3=1\mathrm{.}8F.$ The battery voltage is $V_0=12V.$

$14\%$ Part $($a$)$ Enter an expression for the equivalent capacitance, $C_{12},$ of the two capacitors $C_1$ and $C_2$ in terms of the variables given in the problem s $C_{12}=C_1+C_2$

$$ Correct!

$14\%$ Part $($b$)$ Using the result from Part $($a$),$ express the total equivalent capacitance, $C_{eq},$ in terms of $C_{12}$ and $C_3.$

$C_{eq}=\frac{C_{12}{C}_3}{C_{12}+C_3}$

$$ Correct!

$14\%$ Part $($c$)$ Calculate the numeric value, in microfarads, of the total equivalent capacitance.

$14\%$ Part $($d$)$ Express the charge, $Q,$ stored in the circuit in terms of the equivalent capacitance, $C_{eq},$ and the potential difference across the battery, $Q=C_{eq}{v}_0$

$$ Correct!

$14\%$ Part $($e$)$ Calculate the numeric value, in microcoulombs, of the charge stored in the circuit.

$14\%$ Part $($f$)$ Express the energy stored in the capacitor in terms of the equivalent capacitance, $C_{eq},$ and the potential across the battery, $V_0.U=(\frac{1}{2})C_{eq}{V}_0^2$

$$ Correct!

$14\%$ Part $($g$)$ Calculate the numeric value, in microjoules, of the energy stored in the circuit.

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