Magnetism and Matter Set 3

The ratio of magnetic moments of two bar magnets is These magnets held together in a vibration magnetometer oscillate with 15 oscillations per minute in earth's magnetic field with like poles together. What will be the frequency of oscillations of system if unlike poles are together

At the magnetic poles of the earth, a compass needle will be

The length of magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 s. The magnet is cut along its length into three equal parts and these parts are then placed on each other with their like poles together. The time period of this combination will be

A compass needle placed at a distance from a short magnet in a tan position shows a deflection of 60. If the distance is increased to , the deflection of compass needle is

A deflection magnetometer is adjusted in the usual way. When a magnet is introduced, the deflection observed is, and the period of oscillation of the needle in the magnetometer is T. When the magnet is removed, the period of oscillation is The relation between T and is

The magnetic field of earth is due to

A bar magnet is placed north-south with its north pole due north. The points of zero magnetic field will be in which direction from center of magnet

A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of . If the current be reduced by a factor of , the deflection would

A magnet is suspended in such a way that it oscillates in the horizontal plane. It makes at a place where dip angle is and at a place where dip angle . The ratio of total earth's magnetic field at the two places is

A short bar magnet experiences a torque of magnitude 0.64 J. When it is placed in a uniform magnetic field of 0.32 T, taking an angle of with the direction of the field. The magnetic moment of the magnet is