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in Magnetism and Matter by (26.7k points)
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A closely wound solenoid of 800 turns and area of cross-section 2.5 × 10-4 m2 carries a current of 3.0 A. Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment?

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Given N = 800, A = 2.5 × 10-4 m2 , I = 3.0 A, M = ? 

Since M = NIA 

∴ M = 800 × 3 × 2.5 × 10-4

or M = 0.60 JT-1 along the axis of the solenoid.

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