Question

<module 4a
direction of the magnetic field due to a wire conceptual question
find the direction of the magnetic field at each of the indicated points
for the following two questions consider the wire shown in the figure (figure 1)
part a
what is the direction of the magnetic field \\(\vec{b}_a\\) at point a?
view available hint(s)
\\(\vec{b}_a\\) is out of the page
\\(\vec{b}_a\\) is into the page.
\\(\vec{b}_a\\) is neither out of nor into the page and\\(\vec{b}_a\
eq0\\).
\\(\vec{b}_a = 0\\)

Explanation:

Step1: Apply right - hand rule

Point your right - hand thumb in the direction of the current ($I$). Curl your fingers around the wire. The direction your fingers curl gives the direction of the magnetic field lines around the wire.

Step2: Determine field at point A

For a long straight wire with current flowing to the right, at a point above the wire (point A), by the right - hand rule, the magnetic field is out of the page.

Answer:

$\vec{B}_A$ is out of the page