Three charges ` 0.1` coulomb each are placed on the corners of an equilateral triangle of side `1 m`. If the energy is supplied to this system at the rate of ` 1 kW` how much time would be required to move one to the charges on to the midpoint of the line joining the two ?

Answer

`1.8xx10^(5) sec`

Explanation

`U_(initial")=(KQ^(2))/axx2=(2KQ^(2))/a`
`U_("final")=(KQ^(2))/((a/2))xx2=(4KQ^(2))/a`
`DeltaU=(2KQ^(2))/a=1.8xx10^(8)J=P prop t`
`t=(1.8xx10^(8))/10^(3) sec=1.8xx10^(5)` sec