A student built a simple electromagnet with copper wire, an iron bolt, and a 1.5-volt battery. The electromagnet was able to lift a paper clip from 3 centimeters away. Select THREE ways the student can increase the strength of his electromagnet. A. He can use a thicker piece of copper wire. B. He can reverse the orientation of the battery. C. He can replace the iron bolt with a wooden rod. D. He can add a switch between the battery and the iron bolt. E. He can replace the 1.5-volt battery with a battery of higher voltage. F. He can use a longer piece of wire that wraps more times around the bolt.
The student can increase the strength of his electromagnet by:
A. Using a thicker piece of copper wire.
D. Adding a switch between the battery and the iron bolt.
E. Replacing the 1.5-volt battery with a battery of higher voltage.