MHT CET 2025 Physics question
Not in JEE Advanced syllabus
The magnetic field (B) inside a long solenoid having 'n' turns per unit length and carrying current 'i' when iron core is kept in it, is ( = permeability of vaccum, =magnetic susceptibility)
Answer: (A)
Solution
The magnetising field of the solenoid is . With a core of susceptibility , the magnetic field is , i.e. with $μ_r = 1
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