Two identical tennis balls each having mass m and charge q are suspended from a fixed point by threads of length l . What is the equilibrium separation when each thread makes a small angle θ with the

Question

Two identical tennis balls each having mass m and charge q are suspended from a fixed point by threads of length l . What is the equilibrium separation when each thread makes a small angle θ with the vertical?

TestHub · Accepted Answer

T cos θ = m g T sin θ = k q 2 x 2 tan θ = k q 2 x 2 m g as tan θ ≈ sin θ ≈ x 2 L x 2 L = K q 2 x 2 m g x = q 2 L 2 π ε 0 m g 1 3

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