Physics Electrostatics Potential & Capacitance Karnataka - CET Previous Year Question MCQ (Single Correct)

Two small spheres of masses M 1 and M 2 are suspended by weightless insulating threads of lengths L 1 and L 2 . The spheres carry charges Q 1 and Q 2 respectively. The spheres are suspended such that they are in level with one another and the threads are inclined to the vertical at angles of θ 1 and θ 2 as shown. Which one of the following conditions is essential, if ?

A
, but
B
C
D

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Text Solution

Verified by Experts
The correct answer is:
B

The three forces acting on each sphere are:
(i) Tension
(ii) Weight

(iii) Electrostatic force of repulsion.

For sphere 1

In equilibrium, from figure.

For sphere 2

In equilibrium, from figure

Force of repulsion between two charges are same.

only if

But , then

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