Question

If two conducting spheres are separately charged and then brought in contact, then

• A. The total energy of the two spheres is conserved
• B. The total charge on the two spheres is conserved
• C. Both the total energy and charge are conserved
• D. The final potential is always the mean of the original potentials of the two spheres

Answer 1

The correct option is

D

The total energy and charge on the two spheres is conserved

let's check all the options,

(1) This cannot be true as nothing is said about the size of the sphere. $\sigma \alpha \frac{Q}{R^2}$

(2) energy redistribution takes places

(3) $q_1+q_2=q_1^{\prime }+q_2^{\prime }$

The total energy and charge on the spheres will be conserved