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Two electric charges of 9mu C and -3mu C...

Two electric charges of `9mu C and -3mu C` are placed 0.16m apart in air. There are two points A and B on the line joining the two charges at distance of (1) 0.04m from `-3muC` and in between the charges and (ii) 0.08 m from `-3mu C` and out side the two charges. The potentials at A and B are

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