A $0\mathrm{.}55$ m long section of cable carrying current to a car st

$-$ Part $($a$)$

What is the current in A when the wire experiences a force of $9\mathrm{.}510-3$ N$?$

I $=338\mathrm{.}04$

I $=338\mathrm{.}0338\mathrm{.}0$Correct$!$

$$ Part $($b$)$

If you run the wire through a strong horseshoe magnet, subjecting $5\mathrm{.}00$ cm of it to a perpendicular $1\mathrm{.}75$ T field, what force is exerted on the segment of wire in N$?$