# q2_key - From the origin is 0.500 m Hint For part(b use...

This preview shows page 1. Sign up to view the full content.

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
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online