What is the force, in terms of Coulomb's constant, between two electrical charges of #-2 C# and #4 C# that are #6 m # apart?

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Answer 1 · 2017-02-20T20:07:08

The force would be attractive, and equal in magnitude to #(2k)/9 N#

If we write the constant part of Coulomb's law as #k#, the formula states

#F_E=(kQ_1Q_2)/r^2#

With the values given in this question, the force becomes

#F_E=(k(-2)(4))/6^2 = (k(-8))/36 = (-2k)/9 N#

The negative sign tells us the force is attractive.