a)

Around the perimeter of a closed loop, there is no field lines enclosed through the surface.

Gauss law **cannot** be evaluated around the perimeter of a closed-loop.

To understand the meaning of the variables in Gauss's law, and the conditions under which the law is applicable.

Gauss's law is usually written

where ε_{0 }= 8.85 x 10^{-12} C^{2}/(N • m^{2}) is the permittivity of vacuum.

How should the integral in Gauss's law be evaluated?

a) around the perimeter of a closed loop

b) over the surface bounded by a closed loop

c) over a closed surface

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