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What is the Coulomb's force between two ...

What is the Coulomb's force between two small charged spheres having charge of `2.0 xx10^(-7) C and 3.0 xx 10^(-7)C` placed 30 cm apart in air.

Text Solution

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`q_1 = 2.0 xx10^(-7)C`
`q_2 = 3.0 xx10^(-7)C`
r = 30 cm = 0.3 m
`F=1/(4piin_0)(q_1q_2)/(r^2)`
`F= 9 xx10^9xx(2.0xx10^7xx3.0xx10^(-7))/((0.3)^2)`
`= 9 xx10^9 xx(6.0xx10^(-14))/(9xx10^(-2))`
`F = 6xx10^(-3) N = 6 mN`
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