Question:
Electromagnets are made of soft iron because soft iron has
Electromagnets are made of soft iron because soft iron has
Updated On: May 4, 2024
- low retentivity and high coercive force
- high retentivity and high coercive force
- low retentivity and low coercive force
- high retentivity and low coercive force
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The Correct Option is C
Solution and Explanation
Magnetic retentivity determines the magnetism left in the material after the magnetizing field has been switched off. Electromagnets are operated in conditions requiring fast reversal of polarity, so high retentivity is undesirable.
Susceptibility determines to what extent the material responds to the applied field. This means it determines the extent to which the material will be magnetized when a field of given strength is applied. Therefore, electromagnets must be made of materials having high susceptibility and low retentivity. Soft iron is such a material.
Susceptibility determines to what extent the material responds to the applied field. This means it determines the extent to which the material will be magnetized when a field of given strength is applied. Therefore, electromagnets must be made of materials having high susceptibility and low retentivity. Soft iron is such a material.
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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.
Read More: Magnetism and Matter
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.