(a) If the emf of a coil rotating in a magnetic field is zero at t=0 , and increases to its first peak at t=0.100 ms , what is the angular velocity of the coil? (b) At what time will its next maximum occur? (c) What is the period ofthe output? (d) When is the output first one-fourth of its maximum? (e) When is it next one-fourth of its maximum?

(a) If the emf of a coil rotating in a magnetic field is zero at t=0 , and increases to its first peak at t=0.100 ms , what is the angular velocity of the coil? (b) At what time will its next maximum occur? (c) What is the period ofthe output? (d) When is the output first one-fourth of its maximum? (e) When is it next one-fourth of its maximum?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter32: Faraday’s Law Of Induction

Section: Chapter Questions

Problem 62PQ

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Concept explainers

Ferromagnetism

Ferromagnetism is a mechanism by which some materials show magnetic properties. Iron and magnetite, an oxide of iron, are two naturally occurring materials that show the property of ferromagnetism. The word ferromagnetism is derived from the Latin name of iron, "Ferrum" as it was the first observed material to show such property. The property of ferromagnetism is shown by only a few substances such as iron, nickel, cobalt, and their alloys. Some transition metals and alloys of rare-earth metals also show ferromagnetism.

Question

(a) If the emf of a coil rotating in a magnetic field is zero at t=0 , and increases to its first peak at t=0.100 ms , what is the angular velocity of the coil? (b) At what time will its next maximum occur? (c) What is the period of
the output? (d) When is the output first one-fourth of its maximum? (e) When is it next one-fourth of its maximum?

Definition Definition Rate of change of angular displacement. Angular velocity indicates how fast an object is rotating. It is a vector quantity and has both magnitude and direction. The magnitude of angular velocity is represented by the length of the vector and the direction of angular velocity is represented by the right-hand thumb rule. It is generally represented by ω.

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