## College Physics (4th Edition)

The magnetic force is $5.12 \times 10^{-14}~N$ and this force is directed out of the page.
We can find the magnetic force: $F = q~v\times B$ $F = (-1.6\times 10^{-19}~C)(8.0\times 10^5~m/s)(0.40~T)$ $F = -5.12 \times 10^{-14}~N$ By the right hand rule, $v \times B$ would be directed into the page if the charge was positive. However, the negative charge results in a force directed out of the page. The magnetic force is $5.12 \times 10^{-14}~N$ and this force is directed out of the page.