Three infinitely long charge sheets are placed as shown in figure. The electric field at point P is :
Answer & explanation
Correct answer: option 2
All the three plates will produce electric field at P along negative z-axis. Hence,
$\vec{E}_p =\left[\frac{\sigma}{2 \varepsilon_0}+\frac{2 \sigma}{2 \varepsilon_0}+\frac{\sigma}{2 \varepsilon_0}\right](-\hat{k})$
$=-\frac{2 \sigma}{\varepsilon_0} \hat{k}$
∴ correct answer is (b).