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Which of the following would produce a very strong electromagnet? Select one:a.few coils, high current, heated b.many coils, low current, heated c.many coils, high current, cooled d.few coils, low current, cooled

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ANSWER

EXPLANATION

An electromagnet is a coil wrapped around a ferromagnetic material - such as iron. Its strength increases as the number of turns increases and also if there is more current flowing through the conductor. The strength is also affected by the core material and its temperature.

Hence, the option that produces a very strong electromagnet is c. many coils, high current, cooled.