Cosider a regular cube with positive point charge + Q in all corners except for one which has a negative point chnarge -Q .Let the distance from any corner to the centre of the cube be r. what is the magitude of elelctric fleld at point P the centre of the cude ? `(K=(1)/(4pi epsilon _(0)))`

Options

A. `E=7 K Q //r^(2)`
B. `E=KQ //r^(2)`
C. `E=2K Q//r^(2)`
D. `E=6K Q//r^(2)`

Answer

C

Explanation

`E=(k2Q)/(r^(2))`