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Answer 1 · 2018-03-02T16:16:33

See below

#F=QvB#
(F is force , Q is charge , v is velocity , B is magnetic field)

#color (red)(F=ma)#

#=>ma=QvB#

#=>(ma)/(Qv)=B#

#=>(m(v/t))/(Qv)=B#

#=>(mv)(Qvt)=B#

#=>sqrt (m^2v^2)/(Qd)=B#

#=>sqrt (2mk)/(Qd)=B#
Hope it helps