Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field with like poles together. 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments is -

At a certain place, horizontal component is√3times the vertical component. The angle of dip at this place is -

Two identical mangetic dipoles of magnetic moments 1.0 A-m2 each, placed at a separation of 2m with their axes perpendicular to each other. The resultant magnetic field at a point midway between the dipole is -

Relative permittivity and permeability of a material r and µr, respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

A magnet is suspended horizontally in the earth's magnetic field. When it is displaced and released, it oscillates in a horizontal plane with a period T. If a piece of wood of same M.I as the magnet is attached to the magnet is attached to the magnet, the new period of oscillation of the system would be -

A short magnet produces a deflection of 30° when placed at certain distance in tanA position of magnetometer. If another short magnet of double the length and thrice the pole strength is placed at the same distance in tanB position of the magnetometer, the deflection produced will be -

The ratio of magnetic fields due to a smaller bar magnet in the end on position to broad side on position is-

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

The material suitable for making electromagnets should have -