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18 March, 16:20

If there is an electric force of 5 newtons between two charged particles (q1 = + 10 C and q2 = + 10 C), how far apart are the particles?

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  1. 18 March, 16:26
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    Using the Coulumb law,

    Force (electric) = [k * Q1 * Q2] / d², "d" is "how far apart are the particles" ...

    F = 5 N

    Q1 = 10 C

    Q2 = 10 C

    5 = k * (10) ² / d²

    5*d² = 100*k

    d² = 20*k

    k is the Coulomb's constant : 9*10^9 Nm²/C²

    d² = 20 * (9*10^9)

    d² = 18*10^10

    d = 4.2*10^5 m or 420 km
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