# physics

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Two small charged balls have a repulsive force of 0.20N when they are separated by a distance of 0.90m . The balls are moved closer together, until the repulsive force is 0.58N .

How far apart are they now?

Express your answer to two significant figures and include the appropriate units.

• physics -

Now wait a minute, your questions are really all the same question. The only difference is arithmetic.

F = k Q1Q2 /r^2

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