# Q 1.20(b): A point charge causes an electric flux of  to pass through a spherical Gaussian surface of 10.0 cm radius centred on the charge. What is the value of the point charge?

Given,

Using Gauss’s law, we know that the flux of electric field through any closed surface S is   times the total charge enclosed by S.

i.e.

where, q = net charge enclosed  and   = permittivity of free space (constant)

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