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 ?
Text Solution
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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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