Question

The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is ______.

Options

• 1: K

• K: 1 

• 1: K²

• K²: 1

Answer 1

The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is K: 1.

Explanation:

`"F"_"a" = ("q"_1"q"_2)/(4piepsilon_0"r"^2)`,

`"F"_"b"  = ("q"_1"q"_2)/("K"4piepsilon_0"r"^2) => "F"_"a" : "F"_"b" = "K" : 1`