An electron experiences a force F$=(4\mathrm{.}5$i$2\mathrm{.}9$j$)1013$NF$=(4\mathrm{.}5$i$2\mathrm{.}9$j$)1013$N when passing through a magnetic field B$=(0\mathrm{.}71$T$)$kB$=(0\mathrm{.}71$T$)$k$.$