A small magnet of dipole moment M is kept on the arm of a deflection magnetometer set in tan ⁡ A position at a distance of 0 . 2 m . If the deflection is 60 ° , find the value of M B H = 0.4 × 10 - 4 T

Question

A small magnet of dipole moment M is kept on the arm of a deflection magnetometer set in tan ⁡ A position at a distance of 0 . 2 m . If the deflection is 60 ° , find the value of M B H = 0.4 × 10 - 4 T, 2 .77 A m 2, 8 A m 2, 0 .2 A m 2, 0 .9 A m 2

MARKS App · Accepted Answer

∵ B = B H tan ⁡ θ Or μ 0 4 π . 2 M r 3 = 0.4 × 10 - 4 tan ⁡ 60 ° ∴ μ 0 M 2 π 0.2 3 = 0.4 × 10 - 4 tan ⁡ 60 ° M = 0.4 × 4 π × 0.2 3 × 10 - 4 × 3 2 × μ 0 = 0.00277 × 10 - 4 10 - 7 ∴ M = 2.77 A m 2

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