Q.No.12.8: - Is it true that Gauss’s Law states that the total number of lines of forces crossing any closed surface in the outward direction is proportional to the net positive charge enclosed within surface.

Q.No.12.8: - Is it true that Gauss’s Law states that the total number of lines of forces crossing any closed surface in the outward direction is proportional to the net positive charge enclosed within surface.

Ans: - Yes this is true. According to Gauss’s law the total no of electric field lines coming out of a closed surface is proportional to the total no of charges present in that closed surface.

Mathematically,

The above statement is true.

Q.No.12.7: - Is E necessarily zero inside a charged rubber balloon if balloon is spherical? Assume that charge is distributed uniformly over the surface.

Q.No.12.7: - Is E necessarily zero inside a charged rubber balloon if balloon is spherical? Assume that charge is distributed uniformly over the surface.

Ans: - According to Gauss’s Law if the charge enclosed in the closed surface is zero then flux will be zero out of that surface. In this case the charge is distributed uniformly over the surface and no charge is present

Hence electric field intensity will be zero inside a spherical balloon which has uniformly distributed charge on its surface.