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(a)
tan theta = Fb/mg
= [iLB -u0i^2L/(2pi*2L sin theta) ]/(uL g)
tan 5.2 degree = [-1.55e-4*I + 2e-7*I^2/(2*0.038*sin 5.2 degree) ]/[0.01265*9.8]
0.09101 = [-1.55e-4*I + 2e-7*I^2/(2*0.038*0.09063) ]/[0.01265*9.8]
solving the quadratic equation for I , I = 22.56 A or -17.22 A
so if I is positive , then i1 = 22.56 A
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(b)
if I is negative , then i2 = -17.22 A
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