72. A doubly charged helium atom, whose mass is 6.6 X
Chapter 20, Problem 72(choose chapter or problem)
72. A doubly charged helium atom, whose mass is 6.6 X 10~27kg. is accelerated by a voltage of 2400 V. (a) What will be its radius of curvature in a uniform 0.240-T field? (/>) What is its period of revolution?
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