A point P, is 40 m away from charge 2 mu...

A point P, is 40 m away from charge 2 `mu` C and 20 m away from charge 4 `mu`C. Find the electric potential at point P. How much work to be done for a charge ot - 0.4 C brought from infinity to point P ?

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2250 V , - 900 J

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