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As shown in the above diagram, two wires are both carrying current to the right. The bottom wire's current is $I$ and the top wire's current is $2I$.

Point $P$ is a distance $d$ below the top wire, and the bottom wire is a distance $3d$ below the top wire.

What is the magnitude of the net magnetic field at point P?


$\cfrac{{ \mu }_{ o }I}{2\pi d}$


$\cfrac{{ 3\mu }_{ o }I}{4\pi d}$


$\cfrac{{ 5\mu }_{ o }I}{6\pi d}$


$\cfrac{{ 5\mu }_{ o }I}{4\pi d}$

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