CBSE  /  Class 12  /  Physics  /  Magnetism and Matter

  • 1. 
    In a bar magnet, magnetic lines of force z :

  • are produced only at north pole like rays of light from a bulb
  • starts from north pole and ends at the south pole
  • emerge in circular paths from the middle of the bar
  • run continuously through the bar and outside

  • 2. 
    The Mariner's compass is provided with Gimbals arrangement so as to :

  • keep the needle always horizontal
  • give a direct reading of declination
  • give the direct value of dip
  • all of the above

  • 3. 
    A wire of length I has a magnetic moment M. It is then bent into a semi-circular arc. The neyv magnetic moment is :

  • M
  • M.l.
  • \(\frac{2M}{π}\)
  • \(\frac{M}{π}\)

  • 4. 
    The relation between geometric length (L) and magnetic length (Lm) is:

  • Lm = \(\frac{5}{6}\) Lg
  • Lm = \(\frac{6}{5}\) Lg
  • (a) Lm = Lg
  • Lm = 2RY;UL Lg

  • 5. 
    The radius of curvature of the path of charged particle in a uniform magnetic file is directly proportional to the

  • charge on fie particle
  • Momentum of particle
  • energy of particle
  • Strength of field

  • 6. 
    The magnetic field at the centre of a current carrying circular loop is B. If the radius of the loop is doubled keeping the current unchanged, the magnetic field at the centre of loop will become:

  • \(\frac{B}{2}\)
  • \(\frac{B}{4}\)
  • 2B
  • 4B
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