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The magnetic properties of the different materials A, B and C are shown in the following table:MaterialPermeabilitySusceptibilityTemperaturedependence ofsusceptibilityALow positiveSmall but negativeIndependent oftemperatureBHighVery high 1Susceptibilitydecreases withtemperatureCGreater than 1Small but positiveDecreases withtemperatureWhich of the above three materials should be used for making an electromagnet and why? |
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Answer» The material to be used for making an electromagnet should have high permerability and low retentivity. Moreover, less energy should be utilised for magnetisation of the material. Thus, material B should be used for making the core of an electromagnet. |
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