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
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
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.
  • \(\frac{2M}{π}\)
  • \(\frac{M}{π}\)
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
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
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
0 h : 0 m : 1 s

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