A positive charge q is fixed at the point x=0, y=0 and a negative charge -2qis fixed at the point x=a,y=0. Part A Derive an expression for the potential V at points on the y-axis as a function of the coordinate y. Take V to be zero at an infinite distance from the charges. Express your answer in terms of the given quantities and appropriate constants. Part B At which positions on the y-axis is V= 0? Enter your answers numerically separated by commas. Part C What does the answer to part A become when y>>a?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.