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There is a bar magnent

There is a bar magnent falling through a metal ring. The first metal ring is solid all the way around but in the second metal
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2. asked by H
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a student made an electromagnet using an iron bolt, copper wire three times around the bolt and a battery how can he increase
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2. 145 views
a student made an electromagnet using an iron bolt, copper wire three times around the bolt and a battery how can he increase
1. 1 answer
2. 122 views