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In an electrical circuit drawn below the amount of charge stored in the capacitor is ______ $$\mu C$$
Correct Answer: 60
At steady state (DC), the capacitor branch carries no current. So the 5 Ω branch is open.
step 1: reduce circuit
Only active loop:
battery (10 V) → 4 Ω → 6 Ω → back
Total resistance:
R=4+6=10 Ω
step 2: current in circuit
$$I=\frac{10}{10}=1A$$
step 3: voltage drop
Voltage drop across 4 Ω:
$$V_4=1\times4=4V$$
Voltage drop across 6 Ω:
$$V_6=6V$$
step 4: capacitor voltage
Capacitor is connected between left node and right node (same as ends of 6 Ω)
So voltage across capacitor = voltage across 6 Ω = 6 V
step 5: charge
$$Q=CV=10μF\times6=10\times10^{-6}\times6=60μC$$
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