Question

part b
what is the direction of the magnetic field $vec{b}_b$ at point b?
$vec{b}_b$ is out of the page
$vec{b}_b$ is into the page.
$vec{b}_b$ is neither out of nor into the page and $vec{b}_b
eq0$.
$vec{b}_b = 0$
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part c complete previous part(s)

Explanation:

Step1: Apply right - hand rule for magnetic field.

For a current - carrying wire, using the right - hand rule, if we point the thumb in the direction of the current (to the right in this case), the fingers curl around the wire to indicate the direction of the magnetic field. At a point below the wire, the magnetic field is into the page.

Answer:

$\vec{B}_B$ is into the page.