E=BLV=0.4×0.5×5V=1V
R=R1R2/(R1+R2)=2×4/(2+4)Ω=4/3 Ω
I=E/R=3/4 A
F=BIL=0.4×0.1×3/4 N=0.03N
P=E2/R1=1/2W=0.5W