Asked by chandant | 24th Sep, 2010, 11:01: PM

Expert Answer:

Let x be the separation.
At equilibrium, the forces are,
Vertical component of Tension = Weight of a ball
Tcosθ = mg     .... where θ is the angle made thread with vertical.
Horizontal componenet of Tension = Electrostatic force of repulsion
Tsinθ = kq2/x2
Divivde the second equation by first,
tanθ = kq2/x2
sinθ = kq2/x2   ....... since θ is very small.
(x/2)L = kq2/(mgx2)
x = (2Lkq2/mg)1/3

Answered by  | 25th Sep, 2010, 01:02: AM

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