4. The magnetic strength of a coil depends on a. current direction. b. the left-hand rule. c. flux direction. d. current magnitude. e. the point where the field emerges. 5. A 20-turn coil, with an air core, carries a current of 2 amperes. The magnetic strength of the coil can be increased by a. making the turns larger. b. inserting an iron core. c. decreasing the current. d. slightly decreasing the voltage drop across the coil. e. reversing the current direction. 6. When iron filings are attracted to a current-carrying conductor, this indicates a. a magnetic field direction. b. a N pole. c. the presence of a magnetic field. d. the strength of a magnetic field. e. the magnitude of current. 7. The properties of a magnet are present in a. a loop of wire. b. a straight wire. c. many turns of wire. d. a straight wire carrying current. e. a current-carrying loop of wire.

4. The magnetic strength of a coil depends on a. current direction. b. the left-hand rule. c. flux direction. d. current magnitude. e. the point where the field emerges. 5. A 20-turn coil, with an air core, carries a current of 2 amperes. The magnetic strength of the coil can be increased by a. making the turns larger. b. inserting an iron core. c. decreasing the current. d. slightly decreasing the voltage drop across the coil. e. reversing the current direction. 6. When iron filings are attracted to a current-carrying conductor, this indicates a. a magnetic field direction. b. a N pole. c. the presence of a magnetic field. d. the strength of a magnetic field. e. the magnitude of current. 7. The properties of a magnet are present in a. a loop of wire. b. a straight wire. c. many turns of wire. d. a straight wire carrying current. e. a current-carrying loop of wire.

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter8: Basic Electric Motors

Section: Chapter Questions

Problem 3RQ

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