Rankers Physics

Magnetic Field Due to Circular Current Carrying Wire: Practice Problem & Solution

An otherwise infinite, straight wire has two concentric loops of radii a and b carrying equal currents in opposite directions as shown. The magnetic field at the common centre is zero for Magnetic Field Due to Circular Current Carrying Wire diagram: An otherwise infinite, straight wire has two concentric
\[\frac{a}{b}=\frac{\pi+1}{\pi}\]
\[\frac{a}{b}=\frac{\pi}{\pi+1}\]
\[\frac{a}{b}=\frac{\pi-1}{\pi+1}\]
\[\frac{a}{b}=\frac{\pi+1}{\pi-1}\]

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