A cone of base radius $R$ and height $h$ is located in a uniform electric field…
A cone of base radius $R$ and height $h$ is located in a uniform electric field $\overrightarrow{\mathrm{E}}$ parallel to its base. The electric flux entering the cone is:
$\frac{1}{2} \mathrm{EhR}$
EhR
$2 \mathrm{EhR}$
$4 \mathrm{EhR}$
Solution
Electric flux, $\phi=E(d s) \cos \theta$ $=E(h R) \cos 0^{\circ}=E h R$