# college physics

Consider a long charged straight wire that lies fixed and a particle of charge +2e and mass 6.70E-27 kg. When the particle is at a distance 1.31 cm from the wire it has a speed 2.30E+5 m/s, going away from the wire. When it is at a new distance of 2.71 cm, its speed is 3.10E+6 m/s. What is the charge density of the wire?

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1. Calculate the potential which is energy per unit charge (voltage) .0131 meters from a wire of charge density s. (assuming voltage 0 at infinity)
Then calculate the voltage .0271 meters away.
change in potential energy of the particle in moving is the charge times the change in voltage
that is the change in kinetic energy (1/2 mv^2 if low compared to light speed)

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posted by Damon

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