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A closely wound solenoid of 800 turns an...

A closely wound solenoid of 800 turns and area of cross section `2*5xx10^-4m^2` carries a current of `3*0A`. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment?

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`0.60JT^(-1)` along the axis of the solenoid determind by the sense of flow of the current 4 .
(a) (i) 0.33 J (ii) 0.66 J .
(b) (i) Torque of magnitude 0.33 J in a direction that tends to align the magnitude moment vector along B.
(ii ) Zero.
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