A charge of -3.60 nC and a charge of -5.30 nC are separated by a distance of 40. Find the position at which a third charge of +7.

A charge of -3.60 nC and a charge of -5.30 nC are separated by a distance of 40.0 cm. Find the position at which a third charge of +7.40 nC can be placed so that the net electrostatic force on it is zero.

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