Must Know High School Physics by Christopher Bruhn

Author:Christopher Bruhn
Language: eng
Format: epub, pdf
Publisher: McGraw-Hill Education
Published: 2020-01-17T16:00:00+00:00

Currents Produce Magnetic Fields

Oersted discovered that a current in a wire will produce a magnetic field. The magnetic field forms circles in the plane perpendicular to a wire that is carrying current. That sounds confusing, but picture a wire going through the center of a bunch of circles as seen in the following figure. The direction that the magnetic field is circulating around the wire is the same direction your fingers curl in if you hold the wire with your right hand with your thumb pointing in the direction of the current. This is called a right-hand rule. Call this the right-hand “curly fingers” rule.

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