Question

Two large, then metal plates are parallel and close to each other. On their inner faces, the plates have surface charge densities of opposite signs and of magnitude $16\times {10}^{-22}C{m}^{-2}$. The electric field between the plates is

• A. $1.8\times {10}^{-10}N{C}^{-1}$
• B. $1.9\times {10}^{-10}N{C}^{-1}$
• C. $1.6\times {10}^{-10}N{C}^{-1}$
• D. $1.5\times {10}^{-10}N{C}^{-1}$

Answer 1

The correct option is A $1.8\times {10}^{-10}N{C}^{-1}$

Here, $E=\frac{\sigma }{{\epsilon }_0}=\frac{16\times {10}^{-22}}{8.854\times {10}^{-12}}=1.8\times {10}^{-10}N{C}^{-1}$