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qUESTIONS

MCQs-PYQs-12th-jee

Two short bar magnet of length 1 cm each have magnetic moments 1.20 Am² and 1.00 Am² respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0cm. The value of the resultant horizontal magnetic induction at the mid-point O of the line joining their centres is close to (Horizontal component of earth’s magnetic induction is 3.6 * 10 ^ – 5 * Wb / (m ^ 2)

MCQs-PYQs-12th-jee

The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is B₁. When the dipole moment is double by keeping the current constant, the magnetic field at the centre of loop is B2. The ratio B1/B2 is

MCQs-PYQs-12th-jee

The magnetic susceptibility of paramagnetic materials is

MCQs-PYQs-12th-jee

A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is[2000]

MCQs-PYQs-12th-jee

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment m. Which configuration has highest net magnetic dipole moment[2014]

MCQs-PYQs-12th-jee

An iron rod of length L and magnetic moment M is bent in the form of a semicircle. Now its magnetic moment will be [2013]

MCQs-PYQs-12th-jee

Which of the following statements is true for the three types of magnetism – para, dia and ferro as

MCQs-PYQs-12th-jee

The variation of magnetic susceptibility (x) with magnetisingfield for a paramagnetic substance is

MCQs-PYQs-12th-jee

The relative permeability is represented by μr and the susceptibility is denoted by χ for a magnetic substance. Thenfor a paramagnetic substance

MCQs-PYQs-12th-jee

The variation of the intensity of magnetisation (I) with respect to the magnetising field (H) in a diamagnetic substance is described by the graph.

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