IIT JEE Advanced 2011 Paper 1

A long circular tube of length 10 m and radius 0.3 m carries a current I along its curved surface as shown. A wire-loop of resistance 0.005 Ω and of radius 0.1 m is placed inside the tube with its axis coinciding with the axis of the tube. The current varies as I = I0cos(300t), where I0 is constant. If the magnetic moment of the loop is Nμ0I0sin(300t), then N is ______.