@frank9090
le lettere indicano le intensità
deltay *k = F = P = m*g = ~ 10.2*10^-3 * 9.8 =~ 0.09996 =~0.1 N
F' - P = k*deltay' ---> F' = k*deltay' + k*deltay = (2+1)deltay*k = 3*P = 3*0.1 N
F' = Bli ---> B = F'/(l*i) = 0.3/(0.1*60) = 0.05 T
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