The region in a magnet where magnetic force is concentrated

Iron filings around a bar magnet align themselves in specific curves called magnetic lines of force.

A charged particle going around in a circle can be considered to be a current loop.A particle of mass m carrying charge q is moving in a plane with speed v , under the influence of magnetic field B. The magnetic momnet of this moving particle :

A magnet of magnetic moment M and having moment of inertia I , is suspended to orient freely in the horizontal plane under the influence of earth's magnetic field . If it is slightly disturbed , the time period is given by

(A) : If an electron is not deflected while passing through a certain region of space, then only possibility is that there is no magnetic field in this region (R) : Force on an electron moving in a magnetic field is inversely proportional to the magnetic field applied.

An electron does not suffer any deflection while passing through a region of uniform magnetic field. What is the direction of the magnetic field ?

A charge particle travels along a straight line with a speed v in region where both electric field E and magnetic field b are present.It follows that

The region between x=0 and x=L is filled with uniform steady magnetic field B_0hatk . A particle of mass m, positive charge q and velocity v_0hati travels along x-axis and enters the region of the magnetic field. Neglect the gravity throughout the question. a. Find the value of l if the particle emerges from the region of magnetic field with its final velocilty at an angel 30^@ to its initial velocity. b. Find the final velocity of the particle and the time spent by it in the magnetic field, if themagnetic field now extends upto 2.1 L .

An electron beam produces i) Electrical field around the beam ii) Magnetic field around the beam iii) Electrical field is more stronger than the magnetic field iv) Electrical and magnetic fields are not produced