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s=10cm=0.1m
F=2N
α=30°
I=8A
W=F∙s∙cosα=2∙0.1∙cos30°=0.2 ∙ 0.866 = 0.1732 J
U=W/q= 0.1732 / 5 = 0.03464 V
R=U/I = 0.03464 / 8 = 0.00433 Ω = 4.33 mΩ