Electrostatics Question 5

Question: 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 [NCERT 1971, 84; MP PMT 2001]

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} $

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Answer:

Correct Answer: D

Solution:

When $ \frac{Q _{1}}{R _{1}}\ne \frac{Q _{2}}{R _{2}}; $ current will flow in connecting wire so that energy decreases in the form of heat through the connecting wire.



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