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

If the $B-H$ curves of two samples of $P$ and $Q$ of iron are as shown below,then which one of the following statements is $CORRECT$?

Which of the following is represented by the area enclosed by a hysteresis loop?

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:

$A$ bar magnet has a coercivity of $4 \times 10^3 \text{ A m}^{-1}$. It is placed inside a solenoid of $12 \text{ cm}$ length and $60$ turns. The current that should be passed through the solenoid to demagnetize the bar magnet is: (in $\text{ A}$)

The coercivity of a small magnet where the ferromagnet gets demagnetized is $3 \times 10^3 \ Am^{-1}$. The current required to be passed in a solenoid of length $10 \ cm$ and number of turns $100$,so that the magnet gets demagnetized when inside the solenoid,is:

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