Q. Two identify long parallel conducting plates having surface charge densities $+ \sigma$ and $–\sigma$ respectively, are separated by a small distance. The medium between the plates is vacuum. If $\varepsilon_{0}$ is the dielectric permittivity of vacuum, then the electric field in the region between the plates is
A) $0\ volts/meter$
B) $\frac{\sigma}{2\varepsilon_{0}}\ volts/meter$
C) $\frac{\sigma}{\varepsilon_{0}}\ volts/meter$
D) $\frac{2\sigma}{\varepsilon_{0}}\ volts/meter$
Explanation
(c) Electric field between the plates is
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$= \frac{\sigma}{2\varepsilon_{0}} - \frac{( - \sigma)}{2\varepsilon_{0}}$
$= \frac{\sigma}{\varepsilon_{0}}volt/meter$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.