Question

Two large thin metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and magnitude $27\times {10}^{-22}C{m}^{-2}$. The electric field $\overrightarrow{E}$ in region II in between the plates is

• A. $4.25\times {10}^{-8}N{C}^{-1}$
• B. $6.28\times {10}^{-10}N{C}^{-1}$
• C. $3.05\times {10}^{-10}N{C}^{-1}$
• D. $5.03\times {10}^{-10}N{C}^{-1}$

Answer 1

Answer: (C)

$3.05\times {10}^{-10}N{C}^{-1}$

The value of $\overrightarrow{E}$ in the region II, in between the plates $=\frac{\sigma }{{\epsilon }_0}=\frac{27\times {10}^{-22}}{8.854\times {10}^{-12}}=3.05\times {10}^{-10}N{C}^{-1}$