1.

If 8 identical charges of -g each are placed at the eight corners of a cube of side b, then electrostatic potential energy of a charge +q_0 placed at the centre of the cube will be

Answer»

`(8 sqrt 2 Q q_0)/(4pi epsi_0b)`
`-(8 sqrt 2 q q_0)/(4pi epsi_0b)`
`+ (4 q q_0)/(sqrt3pi epsi_0 b)`
`-(4 q q_0)/(SQRT3 pi epsi_0 b)`

SOLUTION :DISTANCE of each corner of cube from its centre `r = (bsqrt3)/2`
` :.` Potential energy `u = 8[((-q)(q_0))/(4piepsi_0 r)] = -(4qq_0)/(sqrt3pi epsi_0b)`


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