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Unformatted text preview: homework 07 FAUSAK, TAYLOR Due: Mar 3 2008, 4:00 am 1 Question 1, chap 29, sect 1. part 1 of 1 10 points An electron is in a uniform magnetic field B that is directed out of the plane of the page, as shown. v e B B B B When the electron is moving in the plane of the page in the direction indicated by the arrow, the force on the electron is directed 1. toward the left 2. out of the page. 3. into the page. 4. toward the bottom of the page. 5. toward the top of the page. 6. toward the right Question 2, chap 29, sect 1. part 1 of 1 10 points Why will a magnet attract an ordinary nail or paper clip, but not a wooden pencil? 1. A nail or paper clip has a magnet inside which a wooden pencil does not have. 2. A nail or paper clip has magnetic domains which a wooden pencil does not have. 3. A magnet can generate electromagnetic waves which can be absorbed by an nail but not by a pencil. 4. A nail or paper clip has molecular circuits which a wooden pencil does not have. Question 3, chap 29, sect 1. part 1 of 1 10 points Can an electron at rest in a magnetic field be set into motion by the magnetic field? What if it were at rest in an electric field? 1. An electron at rest will be set into mo- tion in a magnetic field but not in an electric field. 2. It cannot be determined because it de- pends on the intensity of the fields, which is not provided in the problem. 3. None of these 4. An electron at rest will be set into motion in an electric field but not a magnetic field. 5. An electron at rest will be set into motion in both fields. 6. An electron at rest will not be set into motion in either fields. Question 4, chap 29, sect 1. part 1 of 1 10 points Will a pair of parallel current-carrying wires exert forces on each other? Why? 1. Yes; the magnetic field generated by the current in one wire is perpendicular to the current in the other wire and vise versa. 2. Yes; the wires are electrically charged. 3. No; the two wires attract each other by the magnetic field generated by their currents and repel each other due to the like charges of the moving particles in the wires. The two forces are equal in magnitude....
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- Spring '07