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A very long charged wire in a particle detector (it can be approximated by an infinite...

A very long charged wire in a particle detector (it can be approximated by an infinite line charge) has a positive linear charge density 4.00×10−12 C/m . A proton (mass 1.67×10−27 kg, charge +1.60×10−19 C) is initially a distance 11.5 cm from the wire and moving directly toward the wire at a speed 2.40×103 m/s .

A) Calculate the proton's initial kinetic energy.

B) How close is the proton to the wire when its speed equals zero?

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