The five questions in this problem are all independent. Which can be considered
ID: 1996003 • Letter: T
Question
The five questions in this problem are all independent. Which can be considered a magnetic dipole? Circle all that are true. an sheet of current a long straight wire carrying current an ideal solenoid an ideal toroid a small current loop a bar magnet Which statements are not true of ferromagnetic materials? Circle all that apply. Domains have permanent magnetic moments which align with external magnetic fields. The relative permeability is large and negative. The large mu_r is usually non-linear. Some magnetization is retained when the external H-field is removed. Ferromagnetic materials are used to make most familiar magnets. Common ferromagnetic materials include Ni, Co, Si and Fe. The x-y plane is the boundary between air above (mu_1 = mu_0 for z > 0) and a magnetic material below (mu_2 = 2000mu_0 for zExplanation / Answer
1) magnetic dipole is considered when the two poles exist or a closed current structure is present which increases their magnetic force and reduces to zero schematically as like a loop with a constant magnetic moment.
A sheet of carrying current, a small current loop and a bar magnet exist magnetic dipole
Remaining have the existance of magnetic field but not a closed loop like structure.
2) the relative permeability of ferromagnetic materials are high and positive.... So 2nd option is not true
Large relative permeability gives the magnetic properties in the medium thus linearity increases so 3rd option is not true.
Remaining all options are true
C) I think the first option is reasonable because in the second medium we have higher relative permeability thus magnetic force applied is more to get linearity and allign in the one direction and it also increases the force to passes through it. Ao first option is reasonable
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