b) Write the substance from which an electromagnet is made,
c) Name two agents of pollution.
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Answer. b.Answer: electromagnet: A magnet made of an insulated wire coiled around an iron core (or any magnetic material such as iron, steel, nickel, cobalt) with electric current flowing through it to produce magnetism. The electric current magnetizes the core material.
c.Generally, there are three pollution agents namely as WATER,AIR and FOREST.
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