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5 December, 04:12

Charges q1 and q2 exerts repulsive forces of 10N on each other what is the repulsive force when their separation is decreasing so that their final separation is 80% of their initial separation?

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  1. 5 December, 04:14
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    15.6 N

    Explanation:

    Coulomb's law:

    F = k q₁ q₂ / r²

    At distance r:

    10 N = k q₁ q₂ / r²

    At distance 0.8r:

    F = k q₁ q₂ / (0.8r) ²

    F = k q₁ q₂ / (0.64r²)

    F = 10 N / 0.64

    F ≈ 15.6 N
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