magnetic moment u = I*A
torque due to magnetic field T1 = u*B*sintheta
theta = 90
T1 = I*A*B
torque due to frictional force T2 = -f*R
net torque = T1 + T2
but in constant angular motion net torque = 0
T1 + T2 = 0
I*A*B - f*R = 0
I*pi*R2*B - f*R = 0
f = I*pi*R*B
f = 3*pi*0.05*1.75
frictional force f = 0.825 N
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