Three point charges of 0.1 C each are placed at the corners of an equilateral triangle with side 1m. If this system is supplied energy at the rate of 1 kW, how much time will be required to move one of the charges on the mid-point of the line joining the two others ?

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