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Answer:
1.These materials are used to make an electromagnet, that's why we should also use them to make one, not only these materials can make an electromagnet but other stuff.
2. They will have to measure the magnets strength by counting the number of paperclips your electromagnet can lift. They can also increase it by using more coils of wire, the number of dry cells also affects the strength of an electromagnet,more dry cells means more electrons flowing in the electromagnet.
3. You could either turn off the switch if you have or turning the batter around.
Explanation:
sabihan nyo nalang po ako kung mali