Chapter 19. Magnetism. Magnets. Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles repel each other and unlike poles attract each other Similar to electric charges Magnetic poles cannot be isolated
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A charged particle moves in a straight line through a certain region of space. The magnetic field in that region (a) has a magnitude of zero, (b) has a zero component perpendicular to the particle's velocity, or (c) has a zero component parallel to the particle's velocity.
QUICK QUIZ 19.1
(b). The force that a magnetic field exerts on a charged particle moving through it is given by F = qvB sin θ = qvB , where B is the component of the field perpendicular to the particle’s velocity. Since the particle moves in a straight line, the magnetic force (and hence B , since qv≠ 0) must be zero.
QUICK QUIZ 19.1 ANSWER
The north-pole end of a bar magnet is held near a stationary positively charged piece of plastic. Is the plastic (a) attracted, (b) repelled, or (c) unaffected by the magnet?
QUICK QUIZ 19.2
(c). The magnetic force exerted by a magnetic field on a charge is proportional to the charge’s velocity relative to the field. If the charge is stationary, as in this situation, there is no magnetic force.
QUICK QUIZ 19.2 ANSWER
If I1 = 2 A and I2 = 6 Ain the figure below, which of the following is true:(a) F1 = 3F2, (b) F1 = F2, or (c) F1 = F2/3?
QUICK QUIZ 19.5
QUICK QUIZ 19.5 ANSWER