The insulated 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_(1)R_(2) = Q_(2)R_(1)`

Answer

D

Explanation

When `(Q_(1))/(R_(1)) !=(Q_(2))/(R_(2))`, current will flow in connecting so that energy decreases in the from of heat through the connecting wire.