MHT CET202411 May 2024Morning ShiftPhysicsMagnetic Effects of CurrentActual
The magnetic flux near the axis and inside the air core solenoid of length 80 cm carrying current ' I ' is 1.57 10⁻⁶ ~Wb . Its magnetic moment will be [cross-sectional area of a solenoid is very small as compared to its length, ₀=4 10⁻⁷ SI unit] ( =3.14)
Options
- A0.25 Am ^2
- B0.50 Am ^2
- C1 Am ^2
- D1.2 Am ^2
Correct answer
C. 1 Am ^2
Step-by-step solution
The magnetic induction inside the solenoid, B= ₀ NI L Magnetic flux, = BA = ₀ NIA ~L aligned Magnetic moment & = NIA = L ₀ & = (1.57 10⁻⁶ ) 0.8 4 10⁻⁷ & =1 Am ^2 aligned