Magnetism and M...

Magnetic field intensity due to a dipole varies as dⁿ, where n is equal to

A closely wound solenoid of 800 turns has area of cross section 2.5 cm². Magnetic moment associated with it, when it carries a current of 3A is

The magnet of pole strength m and magnetic moment M is cut into two pieces along its axis. Its pole strength and magnetic moment now become

Two magnets of equal magnetic moments M each are placed as shown in Fig. The resultant magnetic moment is

What is the resultant magnetic moment of two magnets, each of magnetic moment M in the following figures?

The distance between the poles of a horse shoe magnet is 4 cm. the pole strength of each pole is 40 units. The magnetic potential midway between the poles is

The magnet A (pole strength m) of mass M kg floats on the top of another identical magnet B as shown in Fig. The vertical distance between the two magnets is d metre. The balance condition is achieved due to:

A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40^o. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30^o with the magnetic meridian. In this position, the needle will dip by an angle

Aurora Borealis is a luminous electrical discharge in the upper layers of the atmosphere, which is visible more frequently in

Earth’s magnetic field always has a horizontal component except at