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Magnetic Properties of Matter

54 questions · Physics · JEE Main
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Magnetic Properties of Matter

54 questions · Physics · JEE Main

  1. The relationship between the magnetic susceptibility (x) and the magnetic permeability (μ) is given by : (μ0​ is the permeability of free space and μT​ is relative permeability)2025 · 2 Apr · Shift 1 · Q66 · MCQ
  2. A magnetic dipole experiences a torque of 803​ N m when placed in uniform magnetic field in such a way that dipole moment makes angle of 60∘ with magnetic field. The potential energy of the dipole is :2025 · 3 Apr · Shift 2 · Q55 · MCQ
  3. The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility χMg​=1.2×10−5 ) is :2025 · 7 Apr · Shift 1 · Q52 · MCQ
  4. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Magnetic monopoles do not exist. Reason (R): Magnetic field lines are continuous and form closed loops. In the light…2025 · 7 Apr · Shift 2 · Q65 · MCQ
  5. A bar magnet has total length 2l=20 units and the field point P is at a distance d=10 units from the centre of the magnet. If the relative uncertainty of length measurement is 1%, then uncertainty of the magnetic field at… Includes diagram2025 · 28 Jan · Shift 2 · Q65 · Multiple correct
  6. Match List - I with List - II. Choose the correct answer from the options given below: Includes table2025 · 29 Jan · Shift 2 · Q62 · MCQ
  7. The magnetic moment of a bar magnet is 0.5 Am2. It is suspended in a uniform magnetic field of 8×10−2 T. The work done in rotating it from its most stable to most unstable position is:2024 · 4 Apr · Shift 2 · Q66 · MCQ
  8. Match List I with List II: Choose the correct answer from the options given below : Includes table Includes diagram2024 · 6 Apr · Shift 2 · Q70 · MCQ
  9. Paramagnetic substances: A. align themselves along the directions of external magnetic field. B. attract strongly towards external magnetic field. C. has susceptibility little more than zero. D. move from a region of strong magnetic field…2024 · 8 Apr · Shift 1 · Q71 · MCQ
  10. The coercivity of a magnet is 5×103 A/m. The amount of current required to be passed in a solenoid of length 30 cm and the number of turns 150, so that the magnet gets demagnetised when inside the…2024 · 8 Apr · Shift 2 · Q89 · Numerical
  11. The magnetic potential due to a magnetic dipole at a point on its axis situated at a distance of 20 cm from its center is 1.5×10−5 T m. The magnetic moment of the dipole is ​A m2…2024 · 29 Jan · Shift 1 · Q86 · Numerical
  12. The horizontal component of earth's magnetic field at a place is 3.5×10−5 T. A very long straight conductor carrying current of 2​ A in the direction from South east to North West is placed. The…2024 · 30 Jan · Shift 1 · Q81 · Numerical
  13. The magnetic intensity at the center of a long current carrying solenoid is found to be 1.6×103Am−1. If the number of turns is 8 per cm, then the current flowing through the solenoid is ​ A.2023 · 8 Apr · Shift 1 · Q66 · Numerical
  14. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Electromagnets are made of soft iron. Reason R : Soft iron has high permeability and low retentivity.…2023 · 8 Apr · Shift 2 · Q51 · MCQ
  15. The current required to be passed through a solenoid of 15 cm length and 60 turns in order of demagnetise a bar magnet of magnetic intensity 2.4×103 Am−1 is ​ A.2023 · 10 Apr · Shift 1 · Q73 · Numerical
  16. A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will2023 · 10 Apr · Shift 2 · Q44 · MCQ
  17. Given below are two statements: Statement I : For diamagnetic substance, $$-1 \leq \chi Statement II : Diamagnetic substances when placed in an external magnetic field, tend to move from stronger to weaker part of the field. In the light…2023 · 10 Apr · Shift 2 · Q50 · MCQ
  18. The free space inside a current carrying toroid is filled with a material of susceptibility 2×10−2. The percentage increase in the value of magnetic field inside the toroid will be2023 · 11 Apr · Shift 1 · Q62 · MCQ
  19. Given below are two statements: Statement I : The diamagnetic property depends on temperature. Statement II : The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field. In the light of given…2023 · 12 Apr · Shift 1 · Q54 · MCQ
  20. A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is :2023 · 25 Jan · Shift 1 · Q58 · MCQ
  21. A bar magnet with a magnetic moment 5.0Am2 is placed in parallel position relative to a magnetic field of 0.4 T. The amount of required work done in turning the magnet from parallel to antiparallel position…2023 · 31 Jan · Shift 1 · Q49 · MCQ
  22. The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has2022 · 24 Jun · Shift 2 · Q52 · MCQ
  23. Given below are two statements : Statement I : Susceptibilities of paramagnetic and ferromagnetic substances increase with decrease in temperature. Statement II : Diamagnetism is a result of orbital motions of electrons developing magnetic…2022 · 25 Jun · Shift 2 · Q55 · MCQ
  24. A bar magnet having a magnetic moment of 2.0 × 105 JT − 1, is placed along the direction of uniform magnetic field of magnitude B = 14 × 10 − 5 T. The work done in rotating the magnet slowly through 60 ∘ from the…2022 · 26 Jun · Shift 2 · Q58 · MCQ
  25. The susceptibility of a paramagnetic material is 99. The permeability of the material in Wb/A-m, is : [Permeability of free space μ 0 = 4 π× 10 − 7 Wb/A-m]2022 · 27 Jun · Shift 1 · Q51 · MCQ
  26. The space inside a straight current carrying solenoid is filled with a magnetic material having magnetic susceptibility equal to 1.2 × 10 − 5. What is fractional increase in the magnetic field inside solenoid with respect to air…2022 · 28 Jun · Shift 2 · Q61 · MCQ
  27. Following plots show magnetization (M) vs magnetizing field (H) and magnetic susceptibility (χ) vs temperature (T) graph : Which of the following combination will be represented by a diamagnetic material? Includes diagram2021 · 1 Sep · Shift 2 · Q56 · MCQ
  28. Which of the following statements are correct? (A) Electric monopoles do not exist whereas magnetic monopoles exist. (B) Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined. (C)…2021 · 18 Mar · Shift 2 · Q60 · MCQ
  29. The magnetic susceptibility of a material of a rod is 499. Permeability in vacuum is 4 π× 10 − 7 H/m. Absolute permeability of the material of the rod is :2021 · 20 Jul · Shift 2 · Q63 · MCQ
  30. Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet. Statement II : At high temperature, the domain wall area of a ferromagnetic substance increases. In the light of the…2021 · 22 Jul · Shift 2 · Q57 · MCQ
  31. A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains :2021 · 24 Feb · Shift 2 · Q52 · MCQ
  32. In a ferromagnetic material, below the curie temperature, a domain is defined as :2021 · 25 Feb · Shift 2 · Q54 · MCQ
  33. The value of aluminium susceptibility is 2.2 × 10 − 5. The percentage increase in the magnetic field if space within a current carrying toroid is filled with aluminium is 104x​. Then the value of x is ​…2021 · 25 Jul · Shift 1 · Q67 · Numerical
  34. In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85 × 10 − 2 A/m2 and moment of inertia 5 × 10 − 6 kg m2. If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic…2021 · 27 Jul · Shift 1 · Q72 · Numerical
  35. A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field B . Then the field inside the paramagnetic… Includes diagram2020 · 3 Sep · Shift 2 · Q49 · MCQ
  36. A small bar magnet placed with its axis at 30o with an external field of 0.06 T experiences a torque of 0.018 Nm. The minimum work required to rotate it from its stable to unstable equilibrium position is :2020 · 4 Sep · Shift 1 · Q58 · MCQ
  37. A paramagnetic sample shows a net magnetisation of 6 A/m when it is placed in an external magnetic field of 0.4 T at a temperature of 4 K. When the sample is placed in an external magnetic field of 0.3 T at a temperature of 24 K, then the…2020 · 4 Sep · Shift 2 · Q64 · MCQ
  38. Two magnetic dipoles X and Y are placed at a separation d, with their axes perpendicular to each other. The dipole moment of Y is twice that of X. A particle of charge q is passing, through their midpoint P, at angle q = 45° with the… Includes diagram2019 · 8 Apr · Shift 2 · Q53 · MCQ
  39. A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The corecivity of the bar magnet is :2019 · 9 Jan · Shift 1 · Q46 · MCQ
  40. A magnet of total magnetic moment 10-2 i A-m2 is placed in a time varying magnetic field, B i(cos ωt) where B = 1 Tesla and ω = 0.125 rad/s. The work done for reversing the direction of the magnetic…2019 · 10 Jan · Shift 1 · Q59 · MCQ
  41. A paramagnetic substance in the form of a cube with sides 1 cm has a magnetic dipole moment of 20 × 10–6 J/ T when a magnetic intensity of 60 × 103 A/m is applied. Its magnetic susceptibility is2019 · 11 Jan · Shift 2 · Q62 · MCQ
  42. A paramagnetic material has 1028 atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8 × 10–4. Its susceptibility at 300 K is :2019 · 12 Jan · Shift 2 · Q56 · MCQ
  43. The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solended with 1000 turns/cm. The current that should be passed in the solended to demagnetise the ferromagnet completely is : Includes diagram2018 · 15 Apr · Shift 1 · Q73 · MCQ
  44. A magnetic needle of magnetic moment 6.7 × 10-2 A m2 and moment of inertia 7.5 × 10-6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is:2017 · Shift 0 · Q49 · MCQ
  45. The coercivity of a small magnet where the ferromagnet gets demagnetized is 3×103Am−1. The current required to be passed in a solenoid of length 10cm and number of turns 100, so that the magnet gets demagnetized…2014 · Shift 0 · Q56 · MCQ
  46. Two short bar magnets of length 1cm each have magnetic moments 1.20Am2 and 1.00Am2 respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common…2013 · Shift 0 · Q60 · MCQ
  47. Relative permittivity and permeability of a material εr​ and μr​, respectively. Which of the following values of these quantities are allowed for a diamagnetic material?2008 · Shift 0 · Q65 · MCQ
  48. Needles N1​, N2​ and N3​ are made of ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will2006 · Shift 0 · Q89 · MCQ
  49. A magnetic needle is kept in a non-uniform magnetic field. It experiences :2005 · Shift 0 · Q126 · MCQ
  50. Curie temperature is the temperature above which2004 · Shift 0 · Q141 · MCQ
  51. The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2s. The magnet is cut along its length into three equal parts and these parts are then placed on each…2004 · Shift 0 · Q144 · MCQ
  52. The materials suitable for making electromagnets should have2004 · Shift 0 · Q146 · MCQ
  53. A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60∘. The torque needed to maintain the needle in this position will be :2003 · Shift 0 · Q134 · MCQ
  54. The magnetic lines of force inside a bar magnet2003 · Shift 0 · Q135 · MCQ