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1_Ch 19 College Physics ProblemCH19 Magnetism

1_Ch 19 College Physics ProblemCH19 Magnetism - current in...

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Chapter 19 Magnetism Quick Quizzes 1. (b). The force that a magnetic field exerts on a charged particle moving through it is given by sin Fq v B q v B θ == , 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 ) must be zero. 0 qv 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. 3. (c). The torque that a planar current loop will experience when it is in a magnetic field is given by sin τ θ
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Unformatted text preview: current in the coil, the area enclosed by the coil, and the orientation of the plane of the coil relative to the direction of the field. However, it does not depend on the shape of the loop. 4. (a). The magnetic force acting on the particle is always perpendicular to the velocity of the particle, and hence to the displacement the particle is undergoing. Under these conditions, the force does no work on the particle and the particle’s kinetic energy remains constant. 5. (b). The two forces are an action-reaction pair. They act on different wires and have equal magnitudes but opposite directions. 141...
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