Question:

Force between two identical bar magnets whose centres are $r$ metre apart is $4.8\, N$ when their axes are in the same line. If separation is increased to $2\, r$, the force between them is reduced to

Updated On: Jun 23, 2023
  • 2.4 N
  • 0.6 N
  • 1.2 N
  • 0.3 N
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The Correct Option is D

Solution and Explanation

In magnetic dipole, Force ??1/r ? New force $=\frac{4.8}{2^{4}}=\frac{4.8}{16}=0.3$ N.
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Concepts Used:

Magnetism & Matter

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.

Magnetite is the world’s first magnet. This is also called a natural magnet.  Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.

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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
  • They form closed loops traversing inside the magnet. 
  • 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.