Q. 30

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Answer :

(a) Electric field intensity at point P due to charge –q,

Due to charge +q,

Net electric field at point P,


(b) Only the face perpendicular to the direction of r-axis, contribute to the electric flux. The remaining faces of the cube give zero contribution.


Total flux

(charge enclosed) q=ϵoϕ=2a3ϵo

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