Which of the following is not a unit of time?

Options

A. Total charge contained in any spherical volume with its centre at origin negative.
B. Total charge contained at any spherical volume, irrespective of the location of its centre, is negative
C. Total charge contained in a spherical volume of radius 3 cm with its centre at origin equals `3xx10^(-13) C`
D. Total charge contained in a spherical volume of radius 3 cm with its centre at origin has magnitude `3xx10^(-9) C`.

Answer

A, B, C

Explanation

As the electric field converges at the origin so total charge contained in any spherical volume, irrespective of the location, is negative.
By Gauss theorem `int vec(E).dvec(s)=q/in_(0)`
We have `-E(4pir^(2))=q/in_(0)rArr q=-3xx10^(-13) C`