29. Sources of Magnetic Field
Magnetic Field Produced by Loops and Solenoids
5:25 minutes
Problem 27.71
Textbook Question
Textbook QuestionThe magnetic field B at the center of a circular coil of wire carrying a current I (as in Fig. 27–9) is
B = ( μ₀NI ) / 2r
where N is the number of loops in the coil and r is its radius. Imagine a simple model in which the Earth’s magnetic field of about IG ( = 1 x 10⁻⁴ T) near the poles is produced by a single current loop around the equator. Roughly estimate the current this loop would carry.
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