Magnetic materials used for making permanent | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) Step $1$: Permanent magnets $(P)$ are designed to maintain their magnetization. Therefore, they require high retentivity (to remain magnetized) an

Vedclass · Accepted Answer

$P$: Large retentivity, large coercivity

Vedclass · Answer

(D) Step $1$: Permanent magnets $(P)$ are designed to maintain their magnetization. Therefore, they require high retentivity (to remain magnetized) and high coercivity (to resist demagnetization by external fields or temperature).Step $2$: Transformer cores $(T)$ undergo rapid cycles of magnetization and demagnetization due to alternating current. To minimize energy loss (hysteresis loss), the material must have low retentivity and low coercivity.Step $3$: Comparing the options, option $(D)$ correctly states the requirement for a permanent magnet $(P)$ as having large retentivity and large coercivity.

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

Similar Questions

The study of the hysteresis curve for a given material is used to estimate the:

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:

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:

The intensity of magnetisation $I$ is plotted against the magnetising field $H$ for different substances. The curves $A$ and $B$ shown in the adjoining figure are associated with

The area of the hysteresis loop of a material is equivalent to $250 \, J$. When $10 \, kg$ of the material is magnetized by an alternating field of $50 \, Hz$, what is the energy lost in one hour? (Given: density of the material is $7.5 \, g/cm^3$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module