A long cylindrical wire carries a positive charge of linear density

Question:

A long cylindrical wire carries a positive charge of linear density $2.0 \times 10^{-8} \mathrm{C} / \mathrm{m}$. An electron revolves around it in a circular path under the influence of the attractive electrostatic force. Find the kinetic energy of the electron. Note that is independent of the radius.

Solution:

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