A small metal sphere, carrying a net charge of q1 = -2.80 µC, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q2 = -7.80 µC and mass 1.50 g, is projected toward q1. When the two spheres are 0.800 m apart, q2, is moving toward q1 with speed 22.0 m/s (?Fig. E23.5?). Assume that the two spheres can be treated as point charges. You can ignore the force of gravity. (a) What is the speed of q2 when the spheres are 0.400 m apart? (b) How close does q2 get to q1?
Rosanna Cheng PH 106 02.17.17 and 02.23.17 Pages 560-580 Reading Journal Prediction The chapter will continue to discuss magnetism. Notes 20.1 Magnets and Magnetic Fields * Poles are the ends/faces of a magnet. The pole of a freely suspended magnet pointing toward north is north pole. The other is south pole. Like poles repel, unlike poles attract. Magnetic monopole doesn’t exist, as of now. Ferromagnets are made of iron and show strong magnetic effects. Magnetic fields are like electric fields, with magnetic field lines like electric field lines. However, the m.f. lines always form closed loops. Earth’s geographic poles are different from the magnetic poles: north is magnetically a south pole. Magnetic declination is the angular difference between the dir