1.

A charge q is placed at the centre of a cube of side l. What is the electric flux passing through two opposite faces of the cube?

Answer»

By symmetry, the flux through each of the six faces of the cube will be same when charge q is placed at its centre.

\(\therefore\varphi E=\cfrac16.\cfrac{Q}{\varepsilon_0}\) 

Thus, electric flux passing through two opposite faces of the cube = 2.\(\cfrac16.\cfrac{q}{\varepsilon_0}\)



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