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Transcript
Chapter 21 Discussion January-03-15 8:58 PM Magnetic Forces and Magnetic Fields Discussion Questions 1: When an electrically charged particle is placed near a magnet, does the magnet exert a force on the particle? If so, does a North pole repel or attract a positively-charged particle? 2: If you cut a bar magnet in half, will you then end up with an isolated North pole and an isolated South pole? Will the two isolated poles then attract each other? 3: The magnitude of the electric field at a certain location in space is 200 (in the usual SI units) and the magnitude of the magnetic field at the same location is 300 (in the usual SI units). If the directions of the two fields are the same at this certain location, can we then say that the magnitude of the electromagnetic field is 200 + 300 = 500 units at this location? 4: Does the superposition principle apply to magnetic fields and magnetic forces? 5: The textbook makes a big deal about electric potential, but says nothing about magnetic potential. Why not? 6: Consider the magnetic field as you move away from a wire that carries an electric current, along a line perpendicular to the wire. Does the magnitude of the magnetic field decrease in the same way as the electric field strength due to a point charge or the gravitational field strength due to a point mass? That is, is magnetism also an inverse-square force? Ch21D Page 1 inverse-square force? 7: What happens to the magnetic field strength inside a solenoid when you wrap the wire into turns that have a larger radius, while keeping the number of turns per unit length constant? 8: An electrically charged particle is at rest in a region of space that has a uniform magnetic field. If the charge on the particle suddenly doubles, and the magnetic field remains the same, describe how the magnetic force on the particle changes. 9: An electrically charged particle moves at a constant speed parallel to a uniform magnetic field. If the speed of the particle suddenly doubles, and the magnetic field remains the same, (a) describe how the magnetic force on the particle changes. (b) describe how the path of the particle changes. 10: An electrically charged particle moves at a constant speed perpendicular to a uniform magnetic field. If the speed of the particle suddenly doubles, and the magnetic field remains the same, (a) describe how the magnetic force on the particle changes. (b) describe how the path of the particle changes. 11: For two parallel wires, is the force between them attractive or repulsive if (a) the currents in the wires are in the same direction. (b) the currents in the wires are in opposite directions. 12: When a current-carrying loop of wire is placed in a uniform magnetic field, does the force exerted by the magnetic field on the current loop tend to twist the loop so that its symmetry axis becomes more parallel to the magnetic field or more perpendicular to the magnetic field? Ch21D Page 2 13: Explain how a motor works. 14: Explain how a mass spectrometer works. Ch21D Page 3