Question:
Find out the surface charge density at the intersection of point $x=3 \mathrm{~m}$ plane and $x$-axis, in the region of uniform line charge of $8 \mathrm{nC} /$ $m$ lying along the $z$-axis in free space.
Correct Option: 1
Solution:
$\frac{2 \mathrm{~K} \lambda}{\mathrm{r}}=\frac{\sigma}{\varepsilon_{0}}$
$(x=3 m)$
$\sigma=0.424 \times 10^{-9} \frac{\mathrm{C}}{\mathrm{m}^{2}}$