Magnetism
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Questions and Answers

What is the S.I. unit of magnetic flux density?

  • Ampere per meter (A/m)
  • Tesla (T) (correct)
  • Newton per meter (N/m)
  • Weber (Wb)

    • What is the magnetic moment of a bar magnet, if its strength is m and its effective length is 2l?

  • m(l/2)
  • m(l/4)
  • m(2l) (correct)
  • m(l)

    • What is the relationship between magnetic flux density in a material and in vacuum?

  • B = B0/μ
  • B = μB0
  • B = μrB0 (correct)
  • B = B0/μr

    • What is the direction of the magnetic dipole moment vector?

    <p>From south to north pole (D)</p> Signup and view all the answers

    What is the unit of magnetic flux in the CGS system?

    <p>Maxwell (A)</p> Signup and view all the answers

    What is the unit of pole strength in the SI system?

    <p>Ampere × meter (A)</p> Signup and view all the answers

    What is the direction of pole strength with respect to the length of a magnet?

    <p>Perpendicular to the length (B)</p> Signup and view all the answers

    How does the pole strength of a magnet depend on the nature of the material?

    <p>It depends on the nature of the material and area of cross-section (D)</p> Signup and view all the answers

    What is the relationship between the magnetic moment and pole strength of a magnet?

    <p>Magnetic moment is equal to the product of pole strength and length (D)</p> Signup and view all the answers

    What happens to the moment of inertia of a bar magnet when it is cut into n parts?

    <p>It increases by a factor of n^2 (C)</p> Signup and view all the answers

    What is the relation between permeability and susceptibility in a material?

    <p>μ = μ_0 (1 + χ_m) (D)</p> Signup and view all the answers

    What is the unit of permeability in free space?

    <p>Henry per meter (D)</p> Signup and view all the answers

    What is the force between two magnetic poles of strength m1 and m2 lying at a distance r?

    <p>k × m1 × m2 / r^2 (B)</p> Signup and view all the answers

    What is the net magnetic flux through any closed surface?

    <p>Zero (B)</p> Signup and view all the answers

    What is the magnetic field due to an imaginary magnetic pole of strength m at a distance d?

    <p>μ_0 × m / (4π × d^2) (D)</p> Signup and view all the answers

    What is the reason for defining magnetic field as a set of lines or curves called magnetic lines of force?

    <p>To represent the space around a magnetic pole or magnet within which its effect can be experienced (A)</p> Signup and view all the answers

    What is the SI unit of magnetic moment or magnetic dipole moment?

    <p>Ampere meter squared (D)</p> Signup and view all the answers

    What is the magnetic moment of a bar magnet if its strength is m and its effective length is 2l?

    <p>m(2l) (B)</p> Signup and view all the answers

    What is the significance of the magnetic dipole moment vector?

    <p>It represents the strength of a magnet (A)</p> Signup and view all the answers

    What happens to the magnetic moment of a bar magnet when it is cut into n equal parts along the length?

    <p>It decreases by a factor of n (A)</p> Signup and view all the answers

    What is the magnetic induction or magnetic flux density (B) of a magnetised substance?

    <p>The number of magnetic lines of induction inside a magnetised substance crossing unit area normal to their direction (D)</p> Signup and view all the answers

    What is the intensity of magnetisation (I) of a substance?

    <p>The degree to which a substance is magnetised when placed in a magnetic field (D)</p> Signup and view all the answers

    What is the magnetic susceptibility (χm) of a substance?

    <p>The property of the substance which shows how easily it is magnetised (D)</p> Signup and view all the answers

    What is the unit of magnetic intensity (H) in CGS system?

    <p>Oersted (D)</p> Signup and view all the answers

    What is the relation between magnetic intensity (H) and magnetic induction (B) of a substance?

    <p>H is directly proportional to B (C)</p> Signup and view all the answers

    What is the direction of the pole strength with respect to the length of a magnet?

    <p>Perpendicular to the length (A)</p> Signup and view all the answers

    What is the dependence of pole strength of a magnet on the nature of the material?

    <p>It depends on the nature of the material and the area of cross-section (D)</p> Signup and view all the answers

    What is the effect on the moment of inertia of a bar magnet when it is cut into n parts?

    <p>It remains the same (C)</p> Signup and view all the answers

    What is the relationship between the magnetic moment and pole strength of a magnet?

    <p>The magnetic moment is directly proportional to the pole strength (C)</p> Signup and view all the answers

    What is the unit of pole strength in the SI system?

    <p>Ampere-meter (C)</p> Signup and view all the answers

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