Two large circular metal plates each of radius \(50\,\text{cm}\) carrying equal and unlike charges are parallel to each other. If the electric field between the plates is
\[
720\ \text{N C}^{-1},
\]
then the magnitude of charge on any one plate is
Show Hint
For two oppositely charged large parallel plates,
\[
E=\frac{\sigma}{\varepsilon_0}.
\]
First find
\[
\sigma=\varepsilon_0E,
\]
then use
\[
Q=\sigma A.
\]