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Two point charges A and B of magnitude +8 × 10 –6 C and –8 × 10 –6 C respectively are placed at a distance d apart. The electric field at the middle point O between the charges is 6.4 × 10 4 NC –1 . The distance ‘d’ between the point charges A and B is:

1. 2.0 m
2. 3.0 m
3. 1.0 m
4. 4.0 m

Correct answer: 3.0 m

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