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What is the potential energy of the equa...

What is the potential energy of the equal positive point charges of `1 mu C` each held `1 m` apart in air ?

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Two charges q_(1) = 3.0 mu C and q_(2) = - 4.0 mu C initiallly are separated by a distance r_(0) = 2.0 cm . An external agent moves the charges until they are r_(f) = 5.0 cm apart. (i) How much work is done by the electric field in moving the charges from r_(0) to r_(f) ? Is the work positive or negative ? (ii) How much work is donw by the external aganet in moving the charges from r_(0) to r_(f) ? Is the work positive or negative ? (iii) What is the positive energy of the initial state where the charge are r_(0) =2.0 cm apart ? (iv) What is the potential energy of the final state where the charges are r_(f)= 5.0cm apart ? (v) What is the change in potential energy from the initial state to the final state ?