plese answer this question very urgent
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I give you some pictures they are answers of your questions
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2) I would choose the electromagnet bcoz it is just convenient to use in industries if we pass current through a large metal disc it can temporary have all properties like permanent magnet in day to day life we can see use of electromagnet every were for eg Crane for lifting metallic object without hindrance to other metallic object, Motors of fans and mixers
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