Electrostatics — CSIR Net PYQ (Question 6)

A Electrostatics previous-year question (PYQ) from Electromagnetism (CSIR Net). Read the question, check the correct answer, then practise the full topic.

Question 6 of 24 · 5.0 marks

Two uniformly charged insulating solid spheres A and B , both of radius $a$, carry total charges $+Q$ and $-Q$, respectively. The spheres are placed touching each other as shown in the figure. If the potential at the centre of the sphere A is $V_A$ and that at the centre of B is $V_B$, then the difference $V_A-V_B$ is

1. 1$\frac{Q}{4\pi {ϵ}_{0}a}$
2. 2$\frac{-Q}{2\pi {ϵ}_{0}a}$
3. 3$\frac{Q}{2\pi {ϵ}_{0}a}$
4. 4$\frac{-Q}{4\pi {ϵ}_{0}a}$

Correct answer: Option 3

About this question

This Electrostatics PYQ is part of the Electromagnetism section of CSIR Net. Browse more Electrostatics questions or join the PhysicsByAaryan live batch for full conceptual coverage.