Which of the following best describes the phrase "fringing of the flux"?

Magnetic moments are only due to the orbital spin of the electrons around the nucleus.

If a sinusoidal current is applied to a coil wrapped around a ferromagnetic material, what would cause the flux density to be concentrated at the outer edges of the core material?

The energy density (the amount of energy stored in or extracted from a given volume) of the core material can be found by finding the the area between the BH plot and the H axis.

Amperes circuital law states that the line integral of magnetic field intensity around a closed path is equal to the current encircled by that path. This law can only be applied if the cross-sectional area of a conductor is normal to the plane formed by the closed path. 

The following choices bellow describe various situations for a coil wrapped around a ferromagnetic material. Which of the situtaions would also have the effect of widening the BH curve?

The magnetic system shown in the figure below consists of 5444 turns of copper wire wound around a toroidal core. The wire has a resistance of 15 Ω, and the core is made from a ferromagnetic material whose reluctance is negligible compared to that of the airgaps in the system. The thickness of the entire core is uniform and is measured at 2cm. A DC voltage is applied to the coil and the resulting coil current is i=16A. The effect of fringing at the airgaps is considered to be negligible. Calculate the flux density at the lower left airgap.

For the magnetization of a ferromagnetic material, the flux density lags behind the magnetic field intensity. What is the term used to describe this phenomenon?

Which of the following best describes the magnetic skin effect?