MHT CET2019Morning ShiftPhysicsMagnetic Properties of MatterActual
A magnetizing field of 500 A/m produces a magnetic flux of 4 × 10 - 5 Wb in an iron rod of cross-sectional area 0.4 c m 2 . The permeability of the rod in W/b/A-m is
Options
- A4 × 10 - 6
- B1 × 10 - 3
- C2 × 10 - 4
- D3 × 10 - 5
Correct answer
C. 2 × 10 - 4
Step-by-step solution
Given, magnetising field, H = 5000 A/m Magnetic flux, ϕ = 4 × 10 - 5 W b Cross-sectional area, A = 0.4 c m 2 = 4 × 10 - 5 m 2 ∴ Permeability of rod, μ = B H = ϕ A H ∴ ϕ = B A ⇒ B = ϕ A = 4 × 10 - 5 4 × 10 - 5 × 5000 = 2 × 10 - 4 W b A - m