Question:

A metal ring is held horizontally and bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is

Updated On: Aug 3, 2024
  • more than g
  • equal to g
  • less than g
  • either (a) or (c).
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The Correct Option is C

Solution and Explanation

When the magnet is dropped through the ring an induced current is developed into the ring in the direction opposing the motion of magnet
(Lenz's law). Therefore this induced current decreases the acceleration of bar magnet.
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Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.

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Some of the properties of the magnetic field lines are:

  • The lines and continuous and outside the magnet, the field lines originate from the North pole and terminate at the South pole
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  • But here the lines seem to originate from the South pole and terminate at the North pole to form closed loops.
  • More number of close lines indicate a stronger magnetic field
  • The lines do not intersect each other
  • The tangent drawn at the field line gives the direction of the field at that point.