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If 2 similar pith balls of mass m are hung from a common point with the help of 2 long silk threads. The balls carry similar charges q. Assuming theta is very small find an expression for x. Also assuming that each ball loses charge at a rate of 1*10^-9 c/s at what instantaneous relative speed (dx/dt) do the balls approach each other initially?? Please help.

If 2 similar pith balls of mass m are hung from a common point with the help of 2 long silk threads. The balls carry similar charges q. Assuming theta is very small find an expression for x. Also assuming that each ball loses charge at a rate of 1*10^-9 c/s at what instantaneous relative speed (dx/dt) do the balls approach each other initially?? Please help.

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1 Answers

Sher Mohammad IIT Delhi
askIITians Faculty 174 Points
9 years ago
The force between them is kq1q2/x^2

f=md2x/dt2=kq1q2/x^2


integrating both sides gives, the dx/dt

sher mohammad
b.tech, iit delhi

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