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A 10  C charge is divided into two parts and placed at 1 cm distance so that the repulsive force between them is maximum. The charges of the two parts are:

1. 7  C, 3  C
2. 8  C, 2  C
3. 5  C, 5  C
4. 9  C, 1  C

Correct answer: 5  C, 5  C

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