Magnetic materials used for making permanent | vedclass

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Question

(A) For a permanent magnet $(P)$,the material must have high retentivity so that it remains magnetized,and high coercivity so that it is not easily de

Vedclass · Accepted Answer

$T$: Large retentivity,small coercivity

Vedclass · Answer

(A) For a permanent magnet $(P)$,the material must have high retentivity so that it remains magnetized,and high coercivity so that it is not easily demagnetized by external magnetic fields or temperature fluctuations.For a transformer core $(T)$,the material must have high retentivity but very low coercivity to minimize energy loss due to hysteresis during the rapid magnetization and demagnetization cycles of alternating current.Therefore,the correct property is that $T$ requires large retentivity and small coercivity.

Magnetic materials used for making permanent magnets $(P)$ and magnets in a transformer $(T)$ have different properties. Of the following,which property best matches the type of magnet required?

Similar Questions

$A$ bar magnet has a coercivity of $4 \times 10^3 \, A/m$. It is desired to demagnetize it by inserting it inside a solenoid $12 \, cm$ long and having $60$ turns. The current that should be sent through the solenoid is... (in $, A$)

Hysteresis loops for two magnetic materials $A$ and $B$ are given below. These materials are used to make magnets for electric generators,transformer cores,and electromagnet cores. Then it is proper to use:

In the following graph of flux density $(B)$ versus magnetizing force $(H)$,coercivity and retentivity are respectively represented by the points

$A$ bar magnet has a coercivity of $4 \times 10^3 \, A \, m^{-1}$. It is desired to demagnetize it by inserting it inside a solenoid $12 \, cm$ long and having $60$ turns. The current that should be sent through the solenoid is . . . . . . $A$.

Draw the hysteresis curve ($B-H$ loop) and explain it.

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