The line integral of an electric field along the circumference of a circle of radius r, drawn with a point charge Q at the centre will be _______
(A) 1/4πε₀ Q/r
(B) Q/2ε₀r
(C) zero
(D) 2πQr
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C) Zero.
Surface will be a sphere and it makes a surface intersects with all of the field lines.
The surface area bounded by the circle have infinite radius then multiply the result by two as surface will only intersect with lines at upper side of charge.
Gauss' law specifically about the closed surfaces and clearly defined volume with charge enclosed
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