Magnetism and M...

A current carrying loop is placed in a uniform magnetic field in four different orientations I, II, III & IV. Arrange them in the decreasing order of potential Energy.

If a solution of ferromagnetic material is poured into a U-tube and one arm of this is placed between the poles of a strong magnet with the meniscus in line with the field, then the level of the solution will:

................................ was invented by Michel Faraday.

Three plotting compasses are placed close to a current carrying wire wrapped around an insulator as shown in the figure.
How many compass needles will change direction if the current through the wire is increased? (Ignore the effect of the earth's magnetic field.)

 In the given figure, the electron enters into the magnetic field. It deflects in  x direction .
 Two parallel beams of electrons moving in the same direction produce a mutual force 

Ratio of magnetic intensities for an axial point and a point on broad side- on position at equal distance d from the centre of magnet will be $$or$$ The magnetic field at a distance d from a short bar magnet in longitudinal and transverse  positions are in the ratio

For substances hysteresis (B-H) curves are given as shown in figure. For making temporary magnet which of the following is best

An isolated unit north pole expending force of $$2\times { 10 }^{ -7 }N$$ when kept at a distance 1m from a magnetic pole in air. The strength of thr pole is:

Which of the following particles will deviate $$(< \pi /2)$$ maximum and when they enter magnetic field region perpendicularly with same velocity and travels same distance:

A bar magnet is demagnetized by inserting it inside a solenoid of length $$0.2m, 100turas$$, and carrying a current of $$5.2A$$. The coercivity of the bar magnet is: