### Magnetism and Matter

goals
Permeability has an MKS unit of
A metallic block carrying current I is subjected to a uniform magnetic induction $\vec{B}$ as shown in the figure. The moving charges experience a force $\vec{F}$ given by _________ which results in the lowering of the potential of the face ________. Assume the speed of the carriers to be v.

Earth's magnetic field always has a horizontal component except at

A dipole of magnetic moment $2\ A-m^{2}$ is deflected through $30^{o}$ from magnetic meridian. If magnetic field strength of Earth's horizontal component is $H=30\ A/m$, the deflecting couple is
In the hysteresis cycle, the value of $H$ needed to make the intensity of magnetism zero is called