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Unformatted text preview: I ~ B d ~ = B (2 r ) . Fraction of current inside loop: I C I = r 2 R 2 . Magnetic field at radius r < R : B = I C 2 r = Ir 2 R 2 . B increases linearly with r from zero at the center. Magnetic field at the perimeter: B = I 2 R . tsl243 p.1/1...
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- Spring '07