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NCERT Class XII Chapter
Magnetism and Matter
Questions With Solutions

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Question : 5
Total: 25
A closely wound solenoid of 800 turns and area of cross section 2.5 × 10–4m2 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?
Solution:  
A current carrying closely wound solenoid acts like bar magnet. Each of the turn provide a dipole moment and all turns together provides the dipole moment of the magnet.
Total magnetic moment, M = NIA = 800 × 3 × 2.5 × 10–4 = 0.6 A m2
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