Two positive point charges q are placed on the x axis one at x=a and one at x=-a find the electric field at x=0, derive an expression for the electric field at points on the x axis where -aa, x< -a

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Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

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