A cube of side ' 
' has point charges 
located at each of its vertices except at the origin where the charge is 
. The electric field at the centre of cube is:
Text Solution
Verified by ExpertsC
If only 
charges are placedat the corners of cube of side a then electric field at the centre of the cube will be zero.
But in the given condition one (-Q) is placed at one corner of cube so here
and 
(So it will cancel out each other so electric field at centre is due to 
and 
.
Here electric field at centre 
(E.f. 
As, 
In vector form 
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