The figure illustrates how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet

Question

The figure illustrates how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet (A) O Q should be large, O R should be small (B) O Q and O R should both be large (C) O Q should be small and O R should be large (D) O Q and O R should both be small

Tardigrade Admin · Accepted Answer

In the given figure O Q refers to retentivity while O R refers to coercivity, for permanents both retentivity and coercivity should be high.

Q. The figure illustrates how $B$ , the flux density inside a sample of unmagnetised ferromagnetic material varies with $B_{0}$ , the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet

$OQ$ should be large, $OR$ should be small

$OQ$ and $OR$ should both be large

$OQ$ should be small and $OR$ should be large

$OQ$ and $OR$ should both be small

In the given figure $OQ$ refers to retentivity while $OR$ refers to coercivity, for permanents both retentivity and coercivity should be high.

Q. The figure illustrates how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0​, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet

OQ should be large, OR should be small

OQ and OR should both be large

OQ should be small and OR should be large

OQ and OR should both be small