A $0\mathrm{.}262$ kg ball, containing a net charge of $-162\mathrm{.}6$ mC$,$ is thrown horizontally into a region of uniform magnetic field of field strength $10$ Tesla. The ball is traveling perpendicular to the B$-$field at the instant it is thrown, and at that moment, it is known to be traveling at v$=20$ km$/$s$.$ Say, the B$-$field is applied $*$into$*$ the plane of the paper$/$screen$.$

IGNORE the effects of gravity for all parts of this question.