MHT CET2017PhysicsMagnetic Effects of Current
The magnetic flux near the axis and inside the air-core solenoid of length 60 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, μ 0 = 4 π × 10 - 7 SI units)
Options
- A0.25 A m 2
- B0.5 A m 2
- C0.75 A m 2
- D1 A m 2
Correct answer
C. 0.75 A m 2
Step-by-step solution
Magnetic induction inside the solenoid B = μ 0 N I L Magnetic flux, ϕ = B A = μ 0 N I . A L Magnetic moment = N I A = ϕ L μ 0 = 1.57 × 10 - 6 × 0.6 4 × 3.14 × 10 - 7 = 0.75 A m 2