## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

$1 Nm^{2}/C$
Electric flux $\phi$ through any surface is given as: $\phi= E.A=EAcos\theta$ Here, $\theta=\frac{\pi}{2}-30^{\circ}=\frac{\pi}{3}$ $E=200 N/C$, $A= 10\times 10cm^{2}=10^{-2}m^{2}$ Hence, $\phi=200 \times10^{-2}\times\frac{\pi}{3}$$=2\times\frac{1}{2}=1 Nm^{2}/C$