## College Physics (7th Edition)

$2.0\times10^{-14}T$, left looking in the direction of the velocity.
To cancel the effect of gravity magnetic field should be in upward direction. So, magnetic field should be directed into the page or left looking in the direction of velocity. $F=qvB=mg$ Thus, $B=\frac{1.672\times10^{-27}\times10}{1.6\times10^{-19}\times5\times10^{6}}=2.0\times10^{-14}T$