Question: Q. 7. A charge q is placed at the centre of a cube of side l. What is the electric flux passing through each face of the cube?

[O.D. I, II, III 2012]

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Solution:

Ans.

ϕ=q/6ε0

1

[CBSE Marking Scheme, 2012]

Detailed Answer :

If charge ’ q ’ is placed in centre of cube, electric flux

through the surface of cube will be 6ϕ, where ϕ is flux through each face. As per Gauss’s law,

(1)6ϕ=qε0 ϕ=q6ε0

Short Answer Type Questions-I

(2 marks each)



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