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posted by gayathri Tuesday, December 28, 2010 at 5:31pm.

Three charges are arranged in a line. From left to right, the charges are: Q1= -8mC, Q2 = +3mC and Q3 = -4mC. The distance between Q1 and Q2 is 0.3 m, and the distance between Q2 and Q3 is 0.2 m. Calculate the net electrostatic force on Q3.

Add the forces due to Q1 and Q2, upon Q3. They will be in opposite directions. Use Coulomb's law. Note that the distance of Q1 from Q3 is 0.5 m It will be a useful learning exercise, more so than having someone do it for you.

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