Question

A capacitor C₁ of capacitance 5μF 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 10µF as shown in figure. When the switch is closed charge flows between the capacitors. At equilibrium, the charge on the capacitor C₂ is ____ μC.

Answer 1

Correct answer is 100

Before closing the switch

Q = C₁ Vo = 5 x 30 = 150μC 

After closing the switch

Q₂ = C₂V = 10 x 10 =100μC