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$1)$

$2$QUESTION $2$

A wire of length $50$ cm and mass $10$ g is suspended in a horizontal plane $($positive y$-$axis$)$ by a pair of flexible leads. The wire is then subjected to a constant magnetic field of magnitude $0\mathrm{.}5$ T$,$ oriented along the negative x$-$axis. What are the magnitude and direction of the current in the wire needed to remove the tension in the supporting leads?

$0\mathrm{.}39$ A negative z$-$axis

$3\mathrm{.}92$ A negative z$-$axis

$0\mathrm{.}39$ A positive z$-$axis

$3\mathrm{.}92$ A positive z$-$axis