In what way is the behaviour of a diamagnetic material different from that of a paramagnetic when kept in an external magnetic field ?

How will a dia , para ferro magnetic material behave when kept in a non uniform external magnetic field ? Give one example of each of these materials.

On the basis of magnetic properties the substance are classified into three a. What are these three classifications ? b. Explain each of them c. Give there examples for each .

A paramagnetic material is placed in a magnetic field. Consider the following statements : (A) If the magnetic field is increased, the magnetization is increased. (B) If the temperature is increased, the increased the magnetization is increased.

A rod of a magnetic material move with very small velocity v as shown in Figure below , through a uniform magnetic field . Drawn how the magnetic lines of force take shape, if the magnetic material is (i) Ferromagnetic (ii) Paramagnetic and (iii) Diamagnetic.

a. Magnetic field lines show the direction (at every point) along which a small magnetised needle aligns (at the point) Do the magnetic field also represent the lines of force one a moving charged particle at every point ? b. Magnetic field lines can be entirely confined within the core of a toroid , but not within a straight solenoid. Why ? c. If magnetic monopoles existed, how would the Gauss ' law of magnetism be modified ? d. Does a bar magnet exert a torque on itself due to its own field ? Does one element of a current - carrying wire exert a force on another element of the same wire ? e.Magnetic field arises due to charges in motion . Can a system have magnetic moments eventhough its charge is zero ?

When a dielectric is placed in an electric field, it gets polarized. The electric field in a polarized material is less than the applied field. When a paramagnetic substance is kept in a magnetic field, the field in the substance is more than the applied field. Explain the reason of this opposite behaviour.

Each of the batteries shown in figure has an emf equal to 5 V. Show that the magnetic field B at the point P is zero for any set of values of the resistances .

Answer the following questions . a. Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled ? b. Why is diamagnetism , in contrast , almost independent of temperature ? c. If a toroid uses bismuth for its core, will the the field in the core be (slightly ) greater or (slightly ) less than when the core is empty ? d. Is the permeability of a ferromagnetic material independent of the magnetic field ? If not, is it more for lower or higher fields ? e. Magnetic field lines are always nearly normal to the surface of ferreomgnet at every point . (This fact is analogous to the static electric field lines being normal to the surface of conductor at every point). Why ? f. Would the maximum possible magnetisation of paramagnetic sample be of the same order of magnitude as the magnetisation of ferromagnet ?

Two long, straight wires a and b are 2*0 m apart, perpendicular to the plane of the paper as shown in figure . The wire a carries a current of 9*6 A directed into the plane of the figure,The magnetic field at the point P at a distance of 10/11 m from the wire b is zero. Find (a) the magnitude and direction of the current in b, (b) the magnitude of the magnetic field B at the point s and (c) the force per unit length on the wire b .