Problem 3.31

There is an infinitely long straight thread carrying a charge with linear density \(\lambda=0.40 \mu \mathrm{C} / \mathrm{m} .\) Calculate the potential difference between points 1 and 2 if point 2 is removed \(\eta=2.0\) times farther from the thread than point 1 .

\varphi_{1}-\varphi_{2}=\frac{\lambda}{2 \pi \varepsilon_{0}} \ln \eta=5 \mathrm{kV}

Constant Electric Field in a Vacuum