Question

an isolated charged point partivle produces elwctric foreld E at 2m away claculate E at 2m away?

Answer 1

Single point-like charge produce electric field E:

$\displaystyle E = \frac{1}{4 \pi \epsilon_0} \frac{q}{r^2}$

$\displaystyle \frac{1}{4 \pi \epsilon_0} = 8,987 \cdot 10^9 \; [\frac{N \cdot m^2}{C^2}], r=2\, m.$

So, depending on the value of charge, E will be

$\displaystyle E= \frac{8.987 \cdot 10^9}{4} q =2.247 q \;[\frac{V}{m}]$