Cobalt is an example of a _____ material.
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A.
Non-magnetic
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B.
Ferromagnetic
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C.
Diamagnetic
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D.
Paramagnetic
Correct Answer:
B. Ferromagnetic
Explanation:
Cobalt is a ferromagnetic material, placing it in a select group of elements alongside iron and nickel that are naturally magnetic at room temperature. Ferromagnetism is characterized by the presence of unpaired electrons whose spins align parallel to one another, creating a strong, permanent magnetic field. A standout feature of cobalt is its exceptionally high Curie temperature of approximately 1,115 degrees Celsius, the highest of any element, which allows it to maintain its magnetic properties in extreme heat where other materials would become non-magnetic. Because of this stability and strength, cobalt is frequently used to create powerful permanent magnets for high-performance applications like motors, sensors, and medical devices.
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