Moving charges and magnetism

Torque on Current Loop and Magnetic Dipole

  • Torque acting on current loop kept in magnetic field is Τ = Bian sin θ
  • Maximum Torque Τmax = Bian
  • Principle of moving coil galvanometer is when a current carrying coil suspended in a uniform magnetic field it experiences a torque.
  • Poles of magnet are concave in shape to make the magnetic field radial.
  • Soft iron cylinder is kept at the centre of magnetic field to increase the flux.
  • Phosphorus bronze wire used to moving coil galvanometer has high young’s modulus law, rigidity modules.


View the Topic in this video From 27:56 To 55:45

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Torque on a current carrying coil placed in a Uniform Magnetic Field
\tau = NIAB \sin \theta = MB \sin \theta