Two conducting spheres of radii `r_(1)` and `r_(2)` having charges `Q_(1)` and `Q_(2)` respectively are connected to each other. There is

Options

A. No change in the energy of the system
B. An increase in the energy of the system
C. Always a decrease in the energy of the system
D. A decrease in the energy of the system unless `Q_1R_2 =Q_2R_1`

Answer

D

Explanation

Initially potential is different.
When `Q_1/R_1 ne Q_2/R_2` current will flow in connecting wire, so that energy decreases in form of heat through the connecting wire.
Initially potential is different, hence current will flow.