Question: A crude device for measuring charge consists of two small insulating spheres of radius a, one of which is fixed in position. The other is

A crude device for measuring charge consists of two small insulating spheres of radius a, one of which is fixed in position. The other is movable along the x axis and is subject to a restraining force kx, where k is a spring constant. The uncharged spheres are centered at x = 0 and x = d, the latter fixed. If the spheres are given equal and opposite charges of Q/C, obtain the expression by which Q may be found as a function of x. Determine the maximum charge that can be measured in terms of ∈₀, k, and d, and state the separation of the spheres then. What happens if a larger charge is applied?

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