State the factors on which the strength of anelectromagnet depends. Differentiate between anelectromagnet and a permanent magnet. List threeuses of electromagnets.
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Answer:
Difference Between Electromagnet and Permanent MagnetElectromagnetPermanent MagnetThe magnetic properties are displayed when current is passed through itMagnetic properties exist when the material is magnetizedThe strength is adjusted depending upon the amount of flow of currentThe strength depends upon the nature of the material used in its creationRemoval of magnetic properties is temporaryOnce magnetic properties is lost, it becomes uselessIt requires a continuous supply of electricity to maintain its magnetic field.It doesn’t require a continuous supply of electricity to maintain its magnetic fieldIt is usually made of soft materialsIt is usually made of hard materialsThe poles of this kind of magnet can be altered with the flow of currentThe poles of this kind of magnet cannot be changed.