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Two point charges q1 and q2 in a x-y coordinator. q1 has a charge of -3nC...

Two point charges q1 and q2 in a x-y coordinator. q1 has a charge of -3nC and located at (-2m, 0), q2 has a charge of 5nC and located at (1m, 0). Calculate following:

A) electrical potential at (-1m, 0)

B) electrcal field at (-1m, 0)

C) if a third charge q3 of -2nC is located at (-1m, 0) position, what is the electrical force on q3.
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