Two metal plates are separated by 2 cm. The potentials of the plates are `-10` V and `+30` V. The electric field between the two plates is

Options

A. 2000 V `m^(-1)`
B. 500 V `m^(-1)`
C. 3000 V `m^(-1)`
D. 1000 V `m^(-1)`

Answer

A

Explanation

(a): `E -(dV)/(dr) = (30+10)/(2xx10^(-2)) = (40)/(2) xx 10^(2)`
2000 V `m^(-1)`