Closest Approach of Charged Particles · CAP 2007 #9
Physics · electromagnetism
Problem
Two identical particles, each with a mass of 4.5 mg and charge of 30 nC, are moving directly toward each other with equal speeds of 4.0 m/s at the instant when the distance separating the two particles is equal to 25 cm. How far apart will they be from each other at the point of closest approach?
(a) 7.8 cm; (b) 9.8 cm; (c) 12 cm;
(d) 15 cm; (e) 20 cm.