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(a) An infinitely long positively charged straight wire has a linear charge density λcm–1. An electron is revolving around the wire as its centre with a constant velocity in a circular plane perpendicular to the wire. Deduce the expression for its kinetic energy. 

(b) Plot a graph of the kinetic energy as a function of charge density λ

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(a) Infinitely long charged wire produces a radical electric field.

The revolving electron experience an electrostatic force and provides necessarily centripetal force.

Kinetic energy of the electron

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