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

Question

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, 4 × 10 - 6, 1 × 10 - 3, 2 × 10 - 4, 3 × 10 - 5

MARKS App · Accepted Answer

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

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