# Q 1.15(a): Consider a uniform electric field $E=3\times 10^{3}\ \widehat{i}\ N/C$. (a) What is the flux of this field through a square of 10 cm on a side whose plane is parallel to the yz plane?

Given,

$E=3\times 10^{3}\ \widehat{i}\ \frac{N}{C}$

Area of the square = $0.01^2\ m^2$

Since the square is parallel to the yz plane, Therefore it's normal is in x-direction.(i.e $\widehat{i}$ direction )

Therefore, flux through this surface:

$\phi = E.A$

$\implies \phi = (3\times10^3\ \widehat{i}).(0.01\ \widehat{i}) Nm^2/C = \boldsymbol{30 Nm^2/C}$

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