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,







For



(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.


Capture.PNG


Total flux





(charge enclosed) q=ϵoϕ=2a3ϵo


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