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  4. Two thin flat metal plates having large surface area are charged separately to acquire charge densities +σ and -σ. The plates are then brought near to each other and held parallel to each other (Fig.): If EA, EB and EC denote the electric fields at the points A, B and C respectively, then which of the following will be true :

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Q. Two thin flat metal plates having large surface area are charged separately to acquire charge densities $+\sigma$ and $-\sigma$. The plates are then brought near to each other and held parallel to each other (Fig.) : If $E_A, E_B$ and $E_C$ denote the electric fields at the points $A, B$ and $C$ respectively, then which of the following will be true :Physics Question Image

Electric Charges and Fields

Solution:

image
$E_A=\frac{\sigma}{2 \varepsilon_0}-\frac{\sigma}{2 \varepsilon_0}=0 $
$E_C=0,$
$ E_B=\frac{\sigma}{2 \varepsilon_0}+\frac{\sigma}{2 \varepsilon_0}=\frac{\sigma}{\varepsilon_0}$.