Which of the following statements about an electromagnet is not correct?

Physics

WAEC 2003

A. it is a temporary magnet
B. its strength depends on the current
C. its stength depends on the number of turns in its coil
D. it has permanent poles

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Correct Answer: Option D

Explanation

properties of an electromagnet include, 1) its strength depends on current and the number of turns in the coil,2) it is temporary, 3)it does not have permanent poles, and 4) its direction of flow is determined by the direction of current flowing through the coil.

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