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Q.
Three infinitely long charge sheets are placed as shown in figure. The electric field at point $P$ is
IIT JEEIIT JEE 2005Electrostatic Potential and Capacitance
Solution:
All the three plates will produce electric field at P along negative z-axis. Hence,
$E_p= \bigg [\frac {\sigma}{2\varepsilon_0}+ \frac {2 \sigma}{2\varepsilon_0}+ \frac {\sigma }{2\varepsilon_0}\bigg ](-\widehat{k})=-\frac {2\sigma }{\varepsilon_0}\widehat{k}$
$\therefore $ Correct answer is (b).
