(25%) Problem 4: The strength of the magnetic field created by a current-carrying wire found experimentally is
$B = \frac{\mu_0 I}{2\pi r}$
where $r$ is the distance from the wire, $I$ is the current, and $\mu_0 = 4\pi \times 10^{-7} \text{Tm/A}$ is a constant. (From Unit 14
Reading.)
Consider two parallel, current-carrying wires, as in the figure to the right. Wire 1 carries 2.00 A of current into the
screen. Wire 2 carries 5.00 A of current out of the screen. The wires are 0.05 m apart.
