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  4. The electric field due to an infinitely long straight uniformly charged wire at a distance r is directly proportional to

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Q. The electric field due to an infinitely long straight uniformly charged wire at a distance $r$ is directly proportional to

Electric Charges and Fields

Solution:

The electric field due to an infinitely long straight uniformly charged wire at a distance $r$ is
$E=\frac{\lambda}{2 \pi \varepsilon_{0} r}$
where $\lambda$ is the uniform linear charge density and
$\varepsilon_{0}$ is the permittivity of free space.
$E \propto \frac{1}{r}$