Answered: 1. A thin copper rod 1.00 m long has a…

Physics for Scientists and Engineers

10th Edition

ISBN:9781337553278

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter29: Sources Of The Magnetic Field

Section: Chapter Questions

Problem 8P: One long wire carries current 30.0 A to the left along the x axis. A second long wire carries...

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1. A thin copper rod 1.00 m long has a mass of 50.0 g.What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T? (a) 1.20 A (b) 2.40 A (c) 4.90 A (d) 9.80 A (e) none of those answers

2. Electron A is fired horizontally with speed 1.00 Mm/s into a region where a vertical magnetic field exists. Electron B is fired along the same path with speed 2.00 Mm/s. Which electron has a larger magnetic force exerted on it? (a) A does. (b) B does. (c) The forces have the same nonzero magnitude. (d) The forces are both zero (e) none of those answers.

3. An electron moves horizontally across the Earth’s equator at a speed of 2.50 x 106 m/s and in a direction 35.0° N of E. At this point, the Earth’s magnetic field has a direction due north, is parallel to the surface, and has a value of 3.00 x10-5 T. What is the force acting on the electron due to its interaction with the Earth’s magnetic field? (a) 6.88 x 10-18N due west (b) 6.88 x 10-18 N toward the Earth’s surface (c) 9.83 x 10-18 N toward the Earth’s surface (d) 9.83 x 10-18 N away from the Earth’s surface (e) 4.00 x 10-18 N away from the Earth’s surface.

4. The force exerted on a charged object cannot alter the object’s speed. Classify each of the following statements as a characteristic (a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces (e) none of those answers.

5. A particle with electric charge is fired into a region of space where the electric field is zero. It moves in a straight line. Can you conclude that the magnetic field in that region is zero? (a) Yes, you can. (b) No; the field might be perpendicular to the particle’s velocity. (c) No; the field might be parallel to the particle’s velocity. (d) No; the particle might need to have charge of the opposite sign to have a force exerted on it. (e) No; an observation of an object with electric charge gives no information about a magnetic field.

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