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r=1m
I=4A
μ=4π*10^-7 N/A²
F=?
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F=μ*I²*l/(2π*r)
F=4π*10^-7 * 4² * 2 / (2π*1)=2*10^-7 * 16 * 2=64*10^-7
[(N/A²)*A²*m/m=N]