When a conducting wire is looped many times around a nail, the result is a small

Question

When a conducting wire is looped many times around a nail, the result is a small electromagnet. Which if the following statements is false? a. The magnetic fields of the individual loops reinforce each other; that is, they add to give a stronger field. b. The more loops there are, the stronger the electromagnet is. c. The greater the current through the wire, the stronger the electromagnet is. d. The iron nail acquires an induced magnetic field that adds to the net magnetic field of the loops. e. The magnetic field of the iron nail becomes permanent, so it remains even if the current in the conducting wire vanishes.

Explanation / Answer

e. The magnetic field of the iron nail becomes permanent, so it remains even if the current in the conducting wire vanishes.

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