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The eletrostaic force on a small sphere ...

The eletrostaic force on a small sphere of charges `0.4mu C ` due to another small sphere of charge `0. 8 mu C ` in air 0.2 N.
What is the distance between the two spheres?
(b) What is the force on the second sphere due to the first?

Text Solution

Verified by Experts

Here ` q_1 =0.4 muC= 4xx 10^(-7) C,q_2 =0.8 muC =-8xx10 ^(-7) C ` and attractive force in air F =0.2 N
(a) From the relation `F= 9xx 10 ^(9) (q_1q_2)/( r^(2)) , `we have
`r= [( (9xx 10 ^(9)) (q_1q_2))/( F) ]^(1//2) =[( 9xx10^(9)(4xx 10^(-7)xx(8xx10^(-7))))/(0.2)]^(1//2) = 0.12 m or 12 cm `
(b) `|oversetto (F_21) | =|oversetto (F_12) | =0.2 N` (attractive)
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