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Two positively charged objects repel each other with a force of magnitude 180N when the distance...

Two positively charged objects repel each other with a force of magnitude 180N when the distance between them is 15m. When the distance between the same two objects is made 5m, the magnitude of the force between them is

a 20N.

b 60N.

c 180N.

d 540N.

e 1620N.

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