JEE Main Physics question
Assertion: For a mass kept at the centre of a cube of side , the flux of the gravitational field passing through its sides is . Reason: If the direction of a field due to a point source is radial and its dependence on the distance is given as , its flux through a closed surface depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface.
Answer: (A)
Solution
This is just Gauss's law for gravitation: , valid for any closed surface, independent of its shape or size, as
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