A capacitor of unknown capacitance is connected across a battery of V volt. A charge of 360 μC is stored in it. When the potential across the capacitor is reduced by 120 V, the charge stored in the capacitor becomes 120 µC. Calculate V and the unknown capacitance. What would have been the charge on the capacitor if the voltage were increased by 120 V?

A capacitor of unknown capacitance is connected across a battery of V volt. A charge of 360 μC is stored in it. When the potential across the capacitor is reduced by 120 V, the charge stored in the capacitor becomes 120 µC. Calculate V and the unknown capacitance. What would have been the charge on the capacitor if the voltage were increased by 120 V?