Physics 2 Quiz
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A long straight wire carries current I in the +x direction. A student uses the Biot–Savart law to find the magnetic field at a point P located at position r⃗=d y^\vec{r} = d\,\hat{y} directly above the wire. The student sets up the cross product dl⃗×r^d\vec{l} \times \hat{r} where dl⃗=dx x^d\vec{l} = dx\,\hat{x} and states that r^\hat{r} points from the source element toward P, i.e., r^=+y^\hat{r} = +\hat{y}. The student then evaluates x^×y^=+z^\hat{x} \times \hat{y} = +\hat{z} and concludes the field at P points in the +z^+\hat{z} direction. Which of the following correctly assesses this work?
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