Question:
Out of soft iron and steel which has more coercivity, less retentivity.
Out of soft iron and steel which has more coercivity, less retentivity.
Updated On: Jun 2, 2024
- iron
- steel
- both are equal
- can't say
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The Correct Option is B
Solution and Explanation
Coercivity:
Coercivity is the intensity of the applied magnetic field needed to reduce the magnetization of a material to zero. It represents the ability of a ferromagnetic material to resist becoming demagnetized in the presence of an external magnetic field.
Retentivity:
Retentivity is the ability of a material to retain magnetism after the magnetizing force is removed. It refers to the property of a magnetic material to maintain a certain level of magnetism even when the external magnetizing field is reduced to zero.
Since steel requires a stronger magnetic field to reduce its magnetization to zero, it has higher coercivity and lower retentivity compared to soft iron.
So, the correct option is B: Steel.
Coercivity is the intensity of the applied magnetic field needed to reduce the magnetization of a material to zero. It represents the ability of a ferromagnetic material to resist becoming demagnetized in the presence of an external magnetic field.
Retentivity:
Retentivity is the ability of a material to retain magnetism after the magnetizing force is removed. It refers to the property of a magnetic material to maintain a certain level of magnetism even when the external magnetizing field is reduced to zero.
Since steel requires a stronger magnetic field to reduce its magnetization to zero, it has higher coercivity and lower retentivity compared to soft iron.
So, the correct option is B: Steel.
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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.