Question:

Coersivity of a magnet where the ferromagnet gets completely demagnetized is $3 \times 10^3 Am^{?

Updated On: Jun 23, 2023
  • 3 A
  • 30 mA
  • 6 A
  • 60 mA
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The Correct Option is A

Solution and Explanation

$H=nl \, \therefore\, I=\frac{H}{n}=\frac{3\times10^{3}}{1000}=3A$
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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.