A) an electromagnet.
B) a permanent magnet.
C) a unipolar magnet.
D) None of these
Correct Answer: A
Solution :
Option [a] is correct. Explanation: The core of the Earth is an electromagnet. Although the crust is solid, the core of the Earth is surrounded by a mixture of molten iron and nickle. The magnetic field of Earth is caused by currents of electricity that flow in the molten core.
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