31 Year NEET Previous Year Questions: Magnetism & Matter - NEET MCQ

If a diamagnetic substance is brought near northor south pole of a bar magnet, it is [1999]

A bar magnet, of magnetic moment  , is placed in a magnetic field of induction  . The torque exerted on it is

Current i is flowing in a coil of area A and number of turns N, then magnetic moment of the coil, M
is         [2001]

Two magnets of magnetic moments M and 2M  are placed in a vibration magnetometer, with theidentical poles in the same direction. The timeperiod of vibration is T₁. If the magnets areplaced with opposite poles together and vibratewith time period T₂, then           [2002]

A diamagnetic material in a magnetic field moves

According to Curie’s law, the magnetic susceptibilityof a substance at an absolutetemperature T is proportional to [2003]

 A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a  permanent magnet such that  is in the plane of the coil. If due to a current i in the triangle a torque τ acts on it, the side l of the triangle is      [2005]

If the magnetic dipole moment of an atom ofdiamagnetic material, paramagnetic material andferromagnetic material are denoted by μd, μp andμf respectively, then [2005]

Above Curie temperature       [2006]

Nickel shows ferromagnetic property at roomtemperature. If the temperature is increasedbeyond Curie temperature, then it will show                [2007]

Curie temperature is the temperature abovewhich         [2008]

A bar magnet having a magnetic moment of 2× 10⁴ JT^–1 is free to rotate in a horizontal plane.A horizontal magnetic field B = 6 × 10^–4 T existsin the space. The work done in taking the magnetslowly from a direction parallel to the field to a direction 60° from the field is           [2009]

If a diamagnetic substance is brought nearthe north or the south pole of a bar magnet, itis: [2009]

A vibration magnetometer placed in magneticmeridian has a small bar magnet. The magnetexecutes oscillations with a time period of 2 secin earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18microtesla is produced opposite to the earth'sfield by placing a current carrying wire, the newtime period of magnet will be       [2010]

Electromagnets are made of soft iron because soft iron has     [2010]

Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed at P in between the gap of the two magnets at a distance D from the centre O as shown in the Figure

The force on the charge Q is

The magnetic moment of a diamagnetic atom is 

[2010]

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              [2011]
(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 ?

A short bar magnet of magnetic moment 0.4J T^–1 is placed in a uniform magnetic field of 0.16 T. Themagnet is in stable equilibrium when the potentialenergy is [2011M]

A compass needle which is allowed to move in ahorizontal plane is taken to a geomagnetic pole.It : [2012]

A magnetic needle suspended parallel to a magnetic field requires √3 J of work to turn it through 60°. The torque needed to maintain the needle in this position will be : [2012M]

A bar magnet of length ‘ℓ’ and magnetic dipole moment ‘M’ is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be                 [NEET 2013]

A bar magnet of magnetic moment M is placed atright angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, thelength of the magnet will be          [NEET Kar. 2013]