1.

Assertion. A charge q is placed on a hieght h//4 above the centre of a square of side b. The flux associatedwith the square is independent of side length. Reason. Gauss's law is independent fo size of the Gaussian surface.

Answer»

both, Assertion and Reason are true and the Reason is correctexplanation of the Assertion.
both, Assertion and Reason are true, but Reason is not the correctexplanation of the Asserrtion.
Assertion is true, but the Reason is false.
both, Assertion and Reason are false.

Solution :Here, both Assertion and Reasion are true and Reason is the correctexplanation of the Assertion because electric flux linked with a GAUSSIANSURFACE is
`phi_(E) = oint_(S) = vec(E) . d Vec(s) = (1)/(in_(0))`
`XX` charge enclosed by the surface

If a charge `q` isplaced at the centre `O` at the CUBE then electric flux through all the six faces of the cube is `= (q)/(in_(0))`
Electric flux through one face `= (1)/(6) (q)/(in_(0))`
which is independat of side length `b`.


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