Question

The electric field is measured to be 22.7 N/C due to a point charge of 6.1 nC. How far away was the electric field measured?

Answer 1

The field of point charge is described by the formula

$E=k \cdot \frac{|q|}{r^2}$

Where will we write

$r=\sqrt{\frac{k \cdot |q|}{E}}=\sqrt{\frac{9 \cdot 10^9 \cdot 6.1 \cdot 10^{-9}}{22.7}}=1.555 m$