The force between two small charged spheres having charges of `1xx10^(-7)C and 2xx10^(-7)C` placed 20 cm apart in air is
The force between two small charged spheres having charges of `1xx10^(-7)C and 2xx10^(-7)C` placed 20 cm apart in air is
A. `4.5xx10^(-2)N`
B. `4.5xx10^(-3)N`
C. `5.4xx10^(-2)N`
D. `5.4xx10^(-3)N`
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Correct Answer - B
Here, `q_(1)=1xx10^(-7)C,q_(2)=2xx10^(-7)C,r=20cm=20xx10^(-2)m`
`As" "F=(q_(1)q_(2))/(4piepsilon_(0)r^(2))=(9xx10^(9)xx1xx10^(-7)xx2xx10^(-7))/((20xx10^(-2))^(2))`
`=4.5xx10^(-3)N`
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