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Q. A charge of -2.3 nC and a charge of -6.2 nC are separated by a distance of 60.0 cm. Find the position at which a third charge of +7.6 nC can be placed so that the net electrostatic force on it is zero.

Q. What minimum coefficient of kinetic friction is required to bring the crate to a stop over a distance of 5.0 m along the lower surface?

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