Question

A very long wire carries a uniform linear charge density of 7.0 nC/m. What is the electric field strength 16.0 m from the

Answer 1

Electric field due to a long wire is given by

$E = \frac{2 k \lambda}{r}$

here

$k = 9 * 10^9$

$\lambda = 7*10^{-9}$

r = 16 m

$E = \frac{2*9*10^9 *7*10^{-9}}{16}$

$E = 7.875 N/C$