A speaker uses three separate magnets. One is a permanent magnet, and two are electromagnets.
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Q3: Flux density is measured in lines per
Q4: _ occurs when all the molecules of
Q5: The two factors that determine the number
Q6: Because they are always able to align
Q7: When a coil is wound around a
Q9: Magnetic lines of flux repel each other
Q10: There are actually only three substances that
Q11: Energy is required to create a magnetic
Q12: A basic law of physics states that
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