Malik 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 all the ways Malik can improve the strength of his
electromagnet
He can use a longer piece of wire that wraps more times around the bolt.
He can reverse the orientation of the battery.
He can replace the 1.5-volt battery with a battery of higher voltage.
He can replace the iron rod with a wooden rod
He can add a switch between the battery and the iron bolt.
(select all that apply)
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