COMEDK2025PhysicsMagnetic Properties of MatterActual
A metal rod of susceptibility 799 is subjected to a magnetising field of 2000 Am ⁻¹ . The permeability of the material of the rod is: (Given ₀=4 10⁻⁷ TmA ⁻¹ )
Options
- A4.2 10⁻⁷ TmA ⁻¹
- B2.4 10⁻⁵ T m A⁻¹
- C3.2 10⁻⁴ TmA ⁻¹
- D80 10⁻⁷ T m A⁻¹
Correct answer
C. 3.2 10⁻⁴ TmA ⁻¹
Step-by-step solution
The magnetic susceptibility of the material is given as 799 . The relative permeability _r is related to the magnetic susceptibility by the formula _r = 1 + . Substituting the given value, _r = 1 + 799 = 800 . The absolute permeability of the material is given by = ₀ _r . Given ₀ = 4 10⁻⁷ TmA ⁻¹ , we have = (4 10⁻⁷) 800 . Calculating the value, = 3200 10⁻⁷ TmA ⁻¹ = 3.2 10⁻⁴ TmA ⁻¹ . Answer: 3.2 10⁻⁴ TmA ⁻¹