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B
iron, titanium, nickel, cobalt
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C
iron, nickel, aluminum, titanium
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D
iron, nickel, cobalt, titanium
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Solution
The correct option is D iron, nickel, aluminum, titanium Nipermag is an alloy of iron, nickel, aluminium and titanium. This alloys is used for making a permanent magnet which can be used used in loudspeakers, clocks.