What is the electrical force of attraction between two balloons with separate charges of +3.5 x 10-8 C and -2.9 x 10-8 C when separated a distance of 0.65 m?

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Answer 1 · 2015-02-20T11:24:30

The answer is: #F=-2,16xx10^-5N#.

The law is:

#F=1/(4piepsilon_0)(q_1q_2)/r^2#, or #F=k_e(q_1q_2)/r^2#, where

#k_e=8,98*10^9C^-2m^2N# is the constant of Coulomb.

So:

#F=8,98xx10^9C^-2m^2N*(3,5xx10^-8C*(-2,9)xx10^-8C)/(0,65m)^2=#

#=-216xx10^-7N=-2,16xx10^-5N#.