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Just "B" please in detail.  Imagine that we suspend two small plastic spheres with mass m using insulating threads of length L from a common point. If the spheres are uncharged, they will hang so they touch; but when they are both given the same charge q, they repel each other and hang a distance d apart, as shown below. Assume that d is pretty small compared to L but large compared to the diameter of the balls. (a) Explain, using a net force diagram, Why the magnitude of the electrostatic force acting on either ball must be (E1.13) (b) Explain why in this situation we can approximate tan θ ~ (E1.14) 2L By what percentage is this in error if d L/10?

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