Magnetism

Question 1

Explain diamagnetic vs paramagnetic vs ferromagnetic

Answer 1

Dia = not ever magnetized. Paired electron
Para = unpaired e-s but random atom orientation = no net dipole unless exposed to magnetic field. Random motion means after B field removed, non-magnetic again.
Ferro = unpaired e-s like para, but can be strongly permanently magnetized below its Curie temperature.

Question 2

Formula for B field from a straight wire

Answer 2

B = uºi/2πr

Question 3

Formula for B field at center of loop

Answer 3

B = uºi/2r

Question 4

Force on a charge in a B field

Answer 4

F = qvBsinØ

Question 5

Force on straight wire in B

Answer 5

F = iLBsinØ