Physics

Guest

4 May, 14:10

Juanita made an electromagnet by placing an iron bar inside a coil of wire and then running current through the wire. After awhile, she turned off the current. What happened to the bar?

A The bar continued to be magnetic forever.

B The bar's magnetism became weaker over a long time.

C The bar remained magnetic, but only at the poles.

D The bar immediately lost its magnetism.