q2_key - From the origin is 0.500 m. ( Hint: For part (b)...

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PHY-2054C-002, Fall 2008 Instructor: Dr. Bhattacharya Quiz #2, Tuesday, Sept 09 1. A point charge 4.0 μ C is held fxed at the origin. A second point charge 2.50 μ C with mass oF 5.0 × 10 - 4 kg is placed on the x -axis, 0.2 m From the origin. (a) What is the electric potential energy U oF the pair oF charges? (Take U to be zero when the charges have infnite separation.) The potential energy between two point charges is U 1 = k q 1 q 2 r = 9 × 10 9 p 4 × 10 - 6 · 2 . 5 × 10 - 6 0 . 2 P J = 0 . 45 J (b) The second point charge is released From rest. What is its speed when its distance
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Unformatted text preview: From the origin is 0.500 m. ( Hint: For part (b) use conservation of energy) Here the potential energy at a distance 0.5 m is U 2 = k q 1 q 2 r = 9 10 9 p 4 10-6 2 . 5 10-6 . 5 P J = 0 . 18 J Since the 2nd point charge was originally at rest U 1 = 1 2 mv 2 + U 2 or , v = r 2( U 1-U 2 ) m = 32 . 86 m / s...
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