engineering recuitment BARC Stipendiary Trainee Category II 2023 Mock Test Physics Electric Charges and Coulomb's Law
In Coulomb’s law, \(F = \frac{{k\left( {{q_1}{q_2}} \right)}}{{{r^2}}}\), constant k is expressed as (consider air as the medium):
1
(4πε0)2
2
(4πε0)
3
\(\frac{1}{{\left( {2\pi {\varepsilon _0}} \right)}}\)
4
\(\frac{1}{{\left( {4\pi {\varepsilon _0}} \right)}}\)