Question

A capacitor C1 of capacitance 5 μF is charged to a potential of 30 V using a battery. The battery is then removed and the charged capacitor is connected to an uncharged capacitor C2 of capacitance 10 μF as shown in figure. When the switch is closed charge flows between the capacitors. At equilibrium, the charge on the capacitor C2 is ____ μC.

Fig.

Answer 1

The correct answer is 100

Fig.

Let the charge q is flown in the circuit.
So using Kirchoff’s law
$\frac{q}{10}=\frac{150−q}{5}$
q = 100 μC