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Q.

The charges on two sphere are +7 μC and -5 μC respectively. They experience a force F. If each of them is given and additional charge of -2 μC, the new force of attraction will be:

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a

F/2

b

2F

c

F/3

d

F

answer is A.

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Detailed Solution

F=14πε0+7×10−6−5×10−6r2=−14πε035×1012r2NF′=14πε0+5×10−6−7×10−6r2=−14πε035×1012r2N

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