Which metal is commonly used for making an electromagnet?
A. Copper
B. Cobalt
C. Iron
D. Nickel
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Iridium metal
Iridium metal is used by the jewellers to make gold and platinum ornaments heavier. Explanation: Gold and Platinum are not suitable for making jewels in the pure form. So frequently they are mixed with other metals like iridium (Ir) to make them suitable for making jewels.
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