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A charge of 3.0 nC and a charge of 5.8 nC are separated by 53.40 cm. Find the equilibrium position for a -4.7 nC charge.

  • physics -

    Since q1 and q2 are positive charges, q3 in its equilibrium position has to be between them at the distance “x” from the charge q1.
    Use Coulomb’s Law
    F1= k•q1•q3/x²,
    F2 = k •q2•q3/(r-x)²,
    k•q1•q3/x²= k •q2•q3/(r-x)²,
    q1 /x²= q2 /(r-x)².
    Solve for “x”

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