(a) briefly describe the physical origin of bound currents in magnetised materials consider a thin slab of material with uniform magnetisation m. with the aid of a diagram and a qualitative argument, show that the volume bound current density is [5] 3. zero (b) a thin conducting cylindrical shell (or pipe) of radius a and infinite extent is symmetrical about the z-axis. it is surrounded by a linear magnetic material extending out to a cylindrical radius b in which the magnetic susceptibility varies smoothly with cylindrical coordinate as xm(s)= xoa2/s2 for a < s

Ababy stroller is a rest on top of a hill which is 10 m high. the stroller and baby have a mass of 20 kg. what is the potential energy of the baby and stroller?

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference