Questions in magnetism

Select	Question
	The length of a 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 three parts are then placed on each other with their like poles together. The time period of this combination will be
	A magnet oscillating in a horizontal plane has a time period of 2 second at a place where the angle of dip is 30o and 3 seconds at another place where the angle of dip is 60o. The ratio of resultant magnetic fields at the two places is
	Two identical bar magnets are placed on above the other such that they are mutually perpendicular and bisect each other. The time period of this combination in a horizontal magnetic field is T. The time period of each magnet in the same field is
	The radius of the coil of a Tangent galvanometer. which has 10 turns is 0.1m. The current required to produce a deflection of 60° $({B_H} = 4 \times {10^{ - 5}}T)$ is
	Magnets cannot be made from which of the following substances
	The magnetic moment of atomic neon is
	Which of the following is most suitable for the core of electromagnets
	Demagnetisation of magnets can be done by
	A ferromagnetic material is heated above its curie temperature. Which one is a correct statement
	If a diamagnetic substance is brought near north or south pole of a bar magnet, it is