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Magnetism and Matter

47 questions · Physics · NEET
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Magnetism and Matter

47 questions · Physics · NEET

  1. In a uniform magnetic field of 0.049 T, a magnetic needle performs 20 complete oscillations in 5 seconds as shown. The moment of inertia of the needle is 9.8×10−6 kg m2. If the magnitude of… Includes diagram2024 · Q155 · MCQ
  2. In the above diagram, a strong bar magnet is moving towards solenoid-2 from solenoid-1. The direction of induced current in solenoid-1 and that in solenoid-2, respectively, are through the directions: Includes diagram2024 · Q174 · MCQ
  3. Match List I with List II Choose the correct answer from the options given below. Includes table2024 · Q178 · MCQ
  4. A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to: A. hold the sheet there if it is magnetic. B. hold the sheet there if it is non-magnetic. C. move the sheet away from the pole with uniform…2024 · Q195 · MCQ
  5. An iron bar of length L has magnetic moment M. It is bent at the middle of its length such that the two arms make an angle 60∘ with each other. The magnetic moment of this new magnet is :2024 · Q198 · MCQ
  6. The magnetic potential energy, when a magnetic bar of magnetic moment m is placed perpendicular to the magnetic field B is2024 · Q151 · MCQ
  7. The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and ε is a small positive number) is2024 · Q154 · MCQ
  8. The magnetic moment and moment of inertia of a magnetic needle as shown are, respectively, 1.0×10−2 A m2 and π210−6​ kg m2. If it completes 10 oscillations in 10 s… Includes diagram2024 · Q168 · MCQ
  9. The magnetic moment of an iron bar is M. It is now bent in such a way that it forms an arc section of a circle subtending an angle of 60∘ at the centre. The magnetic moment of this arc section is2024 · Q195 · MCQ
  10. The variation of susceptibility (χ) with absolute temperature ( T ) for a paramagnetic material is represented as :2023 · Q126 · MCQ
  11. A big circular coil of 1000 turns and average radius 10 m is rotating about its horizontal diameter at 2 rad s−1. If the vertical component of earth's magnetic field at that place is 2 × 10−5 T and electrical resistance of the…2022 · Q168 · MCQ
  12. In the product F=q(v×B) =qv×(Bi+Bj​+B0​k) For q = 1 and v=2i+4j​+6k…2021 · Q160 · MCQ
  13. A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of , (i) an equilateral tringle of side 'a' (ii) A square of side 'a' The magnetic dipole moments of the coil in each case…2021 · Q165 · MCQ
  14. An iron rod of susceptibility 599 is subjected to a magnetizing field of 1200 A m-1. The permeability of the material of the rod is : (μ0​=4π×10−7TmA−1)2020 · Q125 · MCQ
  15. At a point A on the earth’s surface the angle of dip, δ = + 25o. At a point B on the earth's surface the angle of dip, δ = – 25o. We can interpret that :2019 · Q140 · MCQ
  16. A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains…2018 · Q123 · MCQ
  17. If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by2017 · Q129 · MCQ
  18. A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 μA and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180o against the torque is2017 · Q130 · MCQ
  19. The magnetic susceptibility is negative for2016 · Q124 · MCQ
  20. A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60o is W. Now the torque required to keep the magnet in this new position is2016 · Q125 · MCQ
  21. A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 weber/m2. The coil carries a current of 2 A. If the plane of the coil is inclined at an angle…2015 · Q107 · MCQ
  22. 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 ? Includes diagram2014 · Q126 · MCQ
  23. A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B. If a force F is experienced by each pole of the magnet, the length of the magnet will be2013 · Q129 · MCQ
  24. A current loop in a magnetic field2013 · Q127 · MCQ
  25. 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 Includes diagram2013 · Q128 · MCQ
  26. A magnetic needle suspended parallel to a magnetic field requires 3​J of work to turn it through 60o. The torque needed to maintain the needle in this position will be2012 · Q91 · MCQ
  27. A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It2012 · Q135 · MCQ
  28. A short bar magnet of magnetic moment 0.4 J T−1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is2011 · Q92 · MCQ
  29. 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…2011 · Q126 · MCQ
  30. The magnetic moment of a diamagnetic action is2010 · Q84 · MCQ
  31. Two identical bar magnets are fixed with their centers 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 Includes diagram2010 · Q85 · MCQ
  32. Electromagnets are made of soft iron because soft iron has2010 · Q145 · MCQ
  33. A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is…2010 · Q146 · MCQ
  34. If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is2009 · Q138 · MCQ
  35. A bar magnet having a magnetic moment of 2 × 104 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…2009 · Q139 · MCQ
  36. Curie temperature above which2008 · Q131 · MCQ
  37. Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show2007 · Q114 · MCQ
  38. A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment μ is given by2007 · Q115 · MCQ
  39. Curie temperature above which2006 · Q137 · MCQ
  40. A coil in the shape of an equilateral triangle of side l is suspended between the pole pieces of a permanent magnet such that B is in plane of the coil. If due to a current i in the triangle a torque τ acts on…2005 · Q133 · MCQ
  41. If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by μd, μp and μf respectively, then2005 · Q134 · MCQ
  42. A diamagnetic material in a magnetic field moves2003 · Q136 · MCQ
  43. According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to2003 · Q137 · MCQ
  44. A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to its period and motion if its mass is quadrupled?2003 · Q138 · MCQ
  45. Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are same side then its time period of oscillation is T1. Now the polarity of one of the magnet is reversed then…2002 · Q135 · MCQ
  46. Among which the magnetic susceptibility does not depened on the temperature ?2001 · Q130 · MCQ
  47. Tangent galvanometer is used to measure2001 · Q131 · MCQ