A current-carrying wire has been bent into the form shown in Figure P28.74, with a half-circle of

Question:

A current-carrying wire has been bent into the form shown in Figure P28.74, with a half-circle of radius $R_{1}$ lying in the $x y$ plane connected via two straight segments to a half-circle of radius $R_{2}$ lying in the $y z$ plane. The current direction is as indicated. If $R_{2}=1.5 R_{1}$, what is the direction of the magnetic field at $\mathrm{P}$, which lies at the common center of the half-circles?

Data from Figure P28.74

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