Magnetism and M...

The area enclosed by a hysteresis loop is a measure of

Susceptibility of ferromagnetic substance is

Figure shows a circular area of radius $$R$$ where a uniform magnetic field $$\vec { B }$$ is going into the plane of paper and increasing in magnitude at a constant rate. In rate case, which of the following graphs, drawn schematically, correctly shown the variation of the induced electric field $$E(r)$$?

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to 

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $$22^0$$ with the horizontal. The horizontal component of the earth's magnetic field at the place is known to be $$0.35 G$$. Determine the magnitude of the earth's magnetic field at the place.

Protons and singly iorized atoms of $$U^235 & U^238$$ are passed in turn (which means one after the other and not at the same time) through a velocity selector and then enter a uniform magnetic field. The protons describe semicircles of radius 10 mm. The separation between the ions of $$U^235 and U^238 after describing semicircles is given by.

The two I-H graph A and B in the adjacent figure are for 

The magnetic field in a region is given by B=$$\dfrac{B_0}{L}$$y(k) where L is a fixed length. A conducting rod of length L lies along the Y-axis between the origin and the point (0.L,0). If the rod moves with a velocity v=$$v_0$$i, find the emf induced between thee ends of the rod.

A train is moving from south to north with a velocity of $$90$$ km/h. The vertical component of earth's magnetic induction is $$0.4\times { 10 }^{ -4 }\quad Wb/{ m }^{ 2 }.$$ If the distance between the two rails is $$1 m,$$ what is the induced e.m.f. in its axle?

In a hydrogen atom, an electron of mass m and charge e revolves in an orbit of radius r making n revolutions per second. If the mass of hydrogen nucleus is M, the magnetic moment associated with the orbital motion of electron is :