Question

We know that in Coulomb force F= 1/ 4piE0 . q1q2 / r2 . Now how can we find that 1/ 4piE0 = 9* 109 Nm2/ c2 ?

Answer 1

Hi friend,

The formula given by you is actually the "Columb's law".

As per your condition the value 9×10^9 is being used in many questions for simplification.

This is because of there are some standard values found already .

π =3.14
E° =8.854 ×10^-12

Sub.these values in 1/4πE° you will get the answer 9×10^9.

Hope this helps you a little!!!!