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Q. A single proton or electron has a charge of 1.602 × 10-19 coulombs. How many coulombs of protons and electrons are in each penny?

Q. One electron collides elastically with a second electron initially at rest. After the collision, the radii of their trajectories are r1 and r2. The trajectories are perpendicular to a uniform magnetic field of magnitude B. Determine the energy of the incident electron.

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