A coil is placed in a magnetic field and has a flux FB through it. The coil is stressed so that its areareduces to 75% of its original value. If the plane of the coil stays the same and the flux through itremains the same, how must the magnetic field change?

A coil is placed in a magnetic field and has a flux FB through it. The coil is stressed so that its areareduces to 75% of its original value. If the plane of the coil stays the same and the flux through itremains the same, how must the magnetic field change?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter30: Magnetic Fields And Forces

Section: Chapter Questions

Problem 71PQ

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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 coil is placed in a magnetic field and has a flux FB through it. The coil is stressed so that its area
reduces to 75% of its original value. If the plane of the coil stays the same and the flux through it
remains the same, how must the magnetic field change?

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