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# tsl244 - with magnitude B depending on R only • Current...

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Ampère’s Law: Magnetic Field Outside a Wire Consider a long, straight wire of radius R with current I . Apply Ampère’s law, I ~ B · d ~ = μ 0 I C , to the circular loop of radius r > R . The symmetry dictates that the magnetic field ~ B is directed tangentially
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Unformatted text preview: with magnitude B depending on R only. • Current inside loop: I C = I . • Ampère’s law applied: B (2 πr ) = μ I. • Magnetic field at radius r > R : B = μ I 2 πr . tsl244 – p.1/1...
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