QUESTION $1$

A long, rigid wire lying along the y$-$axis carries a $5$ A current flowing in the positive y$-$direction. If a constant magnetic field of magnitude $0\mathrm{.}3$ T is directed along the positive x$-$axis, what is the magnetic force per unit length on the wire?

$1\mathrm{.}5$ N$/$m positive z$-$axis

$1\mathrm{.}5$ N$/$m negative z$-$axis

$0\mathrm{.}06$ N$/$m negative z$-$axis

$0\mathrm{.}06$ N$/$m positive z$-$axis