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# Discussion: The Hoola-Field

A ring is of the shape of a hoola-hoop of negligible thickness. A ring of radius $$R$$ carries a current $$I$$. Prove that the magnetic field at a given point in the plane of the ring at a distance $$a$$ from the center, due to the magnetic field of the ring, is $B = \dfrac {\mu_0}{2\pi} \cdot IR \cdot \displaystyle\int_{0}^{\pi} \dfrac {R - a \cos \theta}{\sqrt{\left( a^2 + R^2 - 2aR \cos \theta \right)^3}} \, \mathrm{d}\theta.$

Note: This problem originally appeared on the IPhOO.

Note by Ahaan Rungta
3 years, 3 months ago

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