Electrostatics Question 30

Question: The radii of two metallic spheres $ P $ and $ Q $ are $ r _{1} $ and$ r _{2} $ respectively. They are given the same charge. If $ r _{1}>r _{2} $ . then on connecting them with a thin wire, the charge will flow [MP PMT 1985]

Options:

A) From P to Q

B) From Q to P

C) Neither the charge will flow from P to Q nor from Q to P

D) The information is incomplete

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Answer:

Correct Answer: D

Solution:

Since charge flows from high potential to lower potential.

If positive charge is given, then $ {V _{\text{1}}}<{V _{\text{2}}} $ as $ {r _{\text{1}}}>{r _{\text{2}}} $

So positive charge flows from Q ® P If negative charge is given, then $ {V _{\text{1}}}>{V _{\text{2}}} $

So negative charge flows form $ P\to Q $ .

Since it is not given that whether the charge given is positive or negative, hence the information is incomplete.



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