Answer:
1 and 3
Explanation:
<u>1 and 3 </u>
Increasing coils increases strength
COOLING the wire would increase current flow and strength of magnet
Adding an iron core will definitely increase the strength of the electromagnet
Just divide the both, you will get the answer!
does it sound rude?
im sorry for that!
The sun?? It stays in one spot, but from our point of view, it travels around the earth...
Newton's first law of motion.