MHT CET 2024 Physics question
The magnetic flux near the axis and inside the air core solenoid of length 80 cm carrying current 'I' is Wb. its magnetic moment will be [cross-sectional area of a solenoid is very small as compared to its length SI unit] ()
Answer: (C)
Solution
Inside a long solenoid the field is and the flux through a cross-section is , where . The magnetic moment of the solenoid is M = NIA = (nl)IA = l\,(nIA). From the flux, , hence . Substituting $Φ =
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