Answer :


Given:
Charge placed in front of a solid cube: +q
Distance between the charge and the center of the cube: d

Formula used:
Formula for electric field is:
Here, k is a constant and k= =9× 109 Nm2C-2 . q is the point charge and r is the distance between the charge and the point of influence.
Since we have to find electric field at the center of the cube


Hence, electric field at the center of the cube due to a positive charge at a distance d from the center of cube is
.


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