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The magnetic properties of the different materials A, B and C are shown in the following table: MaterialPermeabilitySusceptibilityTemperature dependence of susceptibilityALow positiveSmall but negativeIndependent of temperatureBHighVery high 1Susceptibility decreases with temperatureCGreater than 1Small but positiveDecreases with temperatureWhich 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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