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A long circular tube of length 10 m and ...

A long circular tube of length `10 m` and radius `0.3 m` carries a current `I` along its curved surface as shows in Fig. A wire-loop of resistance `0.005 Omega` and of radius `0.1 m` is placed inside the tube with its axis coincding with the axis of the tube. The current varies as `= I = I_(0) cos(300 t)` where `I_(0)` is constant. If the magnetic moment of the loop is `Nmu_(0)I_(0) sin (300t)`, then `N` is

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