Electric Field Due to a Line of Charge along Its Axis

Q.

Two parallel plane sheets 1 and 2 carry uniform charge densities ${\sigma }_1$ and ${\sigma }_2$ (see Fig. 20.8). The electric field in the region marked I is $({\sigma }_1>{\sigma }_2)$. (Consider the right direction as the positive direction)

1. $-\frac{{\sigma }_1}{2{ϵ}_0}$

2. $-\frac{{\sigma }_2}{2{ϵ}_0}$

3. $-\frac{({\sigma }_1+{\sigma }_2)}{2{ϵ}_0}$

4. $-\frac{({\sigma }_1-{\sigma }_2)}{2{ϵ}_0}$

Q. 118.What is dimension of electric field

Q.

According to Gauss' Theorem, electric field of an infinitely long straight wire is proportional to

1. r

2. 

3. 

4.