A $2$ nC charge moving along$-$x direction at $3$ x$106$ m$/$s speedin a

uniform magnetic field of $0,6$ T along j $($a$)$ Find the force F on the charge

$($b$)$ if the B field is change to $0\mathrm{.}6$ I $+0\mathrm{.}6$ j T$,$ how would the force F

change $($c$)$ If B is change to $0\mathrm{.}8$ i T$,$ what would be the force F$?$