Question

6 betty made a simple electromagnet using just a battery and a wire. what could betty do to increase the strength of her electromagnet? a. coil the wire around a nail. b. coil the wire around a toothbrush. c. coil the wire around a paper towel roll. d. coil the wire around a test tube.

Explanation:

An electromagnet's strength can be increased by using a ferromagnetic core. A nail is made of iron - a ferromagnetic material. Toothbrushes, paper towel rolls, and test tubes are not ferromagnetic.

Answer:

A. Coil the wire around a nail