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qUESTIONS

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20cm, the length of the open organ pipe is

A bar magnet having a magnetic moment of 2 * 10 ^ 4 * J * T ^ – 1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 * 10 ^ – 4 * T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60° from the field is

MCQs-PYQs-12th-jee

A short bar magnet of magnetic moment 0.4JT-1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

MCQs-PYQs-12th-jee

A 250 turn rectangular coil of length 2.1 cm and width 1.25cm carries a current of 82mu*A are subjected to a magnetic field of strength 0.85T. Work done for rotating the coil by 180° against the torque is

MCQs-PYQs-12th-jee

A diamagnetic material in a magnetic field moves

MCQs-PYQs-12th-jee

The magnetic susceptibility does not depend upon the temperature in

MCQs-PYQs-12th-jee

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material is denoted by μα, μρ, μ; respectively then

MCQs-PYQs-12th-jee

There are four light-weight-rod samples, A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted(i) A is feebly repelled (ii) B is feebly attracted (iii) C is strongly attracted (iv) D remains unaffected Which one of the following is true?

MCQs-PYQs-12th-jee

Curie’s law can be written as

MCQs-PYQs-12th-jee

When a ferromagnetic material is heated to temperature above its Curie temperature, the material

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