Para-, dia- and ferromagnetism, effect of temperature
- Match List-I with List-II.List-I (Material): A. Diamagnetic; B. Ferromagnetic; C. Paramagnetic; D. Non-magneticList-II (Susceptibility ()): I. =0; II. 0>≥-1; III. 1; IV. 0<<ε (a small positive number)Choose the correct answer from the options given b… Answer: 2. A-II, B-III, C-IV, D-I Key idea: The sign and size of magnetic susceptibility chi identify the type of material. Diamagnetic: chi... 1
- An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A m^-1. The permeability of the material of the rod is :(μ_0 = 4π×10^-7 T m A^-1) Answer: 1. 2.4π×10⁻⁴ T m A ⁻¹ Relative permeability μ_r=1+chi=1+599=600 . μ=μ₀μ_r=4π×10⁻⁷×600=2.4π×10⁻⁴\ T m A⁻¹ The magnetising field 1200... 1
- A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational po… Answer: 1. the current source A static magnetic field exerts a force perpendicular to the motion of charges, so it does no net work itself.... 1
- The magnetic susceptibility is negative for : Answer: 1. diamagnetic material only Key idea: only diamagnetic materials get magnetised opposite to the applied field. Diamagnetic: chi sma... 1