Question

After the switch in the circuit below has been closed for a long. What will the charge be on the capacitor plates?

• A. 30.0 microcoulombs
• B. 0.300 microcoulombs
• C. 150 microcoulombs
• D. 6.00 microcoulombs
• E. 1.50 microcoulombs

Answer 1

The correct option is A 30.0 microcoulombs

When the switch S is closed for long time, the capacitor will be fully charged through the resistor. So no current will flow through the circuit after fully charged of capacitor. Thus, the potential across capacitor will be $10V$.

Hence, charge on the capacitor is $Q=CV=3\left(10\right)=30\mu C$