# Test4Review.pdf - Physics 102 East Los Angeles College...

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Physics 102, East Los Angeles College Review Sheet, TEST #4 Mr. V. Kiledjian 1) A charge of +.4 μC is at (-5, 0) meters and a charge of -.6 μC is at (+3, 0) meters. a) Find the electric potential at the origin. Where is the electric potential zero on the x-axis? Where is it +500 volts on the x-axis? If there is a 2 meter rod from (0, 0) to (0, 2) meters, what is the potential difference between the two ends of the rod? Which direction will the electrons in the rod flow? b) How much work is required to separate these charge to infinity? (this is the ionization energy) c) If the charges are allowed to come together freely, where will they end up & what is their final velocity? Assume that each charge has a mass of 1 mKg and a radius of .1 meters. d) How much work is required to bring a third charge +.5μC from infinity to the origin at constant speed? e) If the third charge is allowed to come freely from infinity, what will its speed be at the origin? Assume that its mass is also 1 mKg. 2) A rod of length 10 meters and charge .6 μC lies along the x-axis from (-5, 0) to (5, 0) meters.
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