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mV^2/r=qVB
mV/r=qB
r=mV/qB
m=0,002 kg
B=2*10^7 T
V=4000m/s
q=10 do potegi -6 kulomba
Wstawiasz i masz promien xD
Bqv=mv²/r - v mozemy skrócić
Bq=mv/r
r=mv/Bq
r=2×10⁻³kg×4×10³m/s:(2×10⁷T×10⁻⁶C)
r=8:20
r=0,4m