Question

The charge per unit length for a very long straight wire is $\lambda$. The electric field at points near the wire (but outside it) and far from the ends varies with distance r as :

• A. r
• B. 1/r
• C. 1/r${}^2$
• D. 1/r${}^3$

Answer 1

The correct option is B 1/r

This can easily be calculated using Gauss Law as shown in the concept above. which clearly shows that the electric field at points near the wire (but outside it) and far from the ends varies with distance r as $\frac{1}{r}$