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Coulomb's law question,pls explain this?

Two point charges of +2 µC and +6 µC repel each other with a force of 12 N.if each is given an additional charge of -4 µC,then what will be the new force?

2 Answers

Relevance
  • 10 years ago
    Favorite Answer

    Force is proportional to the product of charges.

    Initial product of charges = (2)(6) = 12 µC^2

    New product of charges = (2-4)(6-4) = (-2)(2) = -4 µC^2

    New force/original force = -4/12 = -1/3

    New force = -12/3 = -4 N

    Negative sign shows that the charges attract each other.

    Ans: Charges will attract each other with a force of 4 N

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  • Quark
    Lv 6
    10 years ago

    Coulomb's law : F = kQ1. Q2/r^2

    -----> 12 = k 2. 6/r^2

    -----> F' = k (2-4)(6-4)/r^2

    --------------------------------------- :

    12/F' = 12/4 ---> F' = 4 N

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