How does the diagram between paragraphs 9 and 10 contribute to the reader's understanding of the
passage?
1. It clarifies how electrons flow between a battery
and the device it powers.
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2. It emphasizes how much energy can be
produced in relation to the size of its source.
3. It reveals that electromagnetic fields tend to
cause objects that are placed within them to
move.
4. It demonstrates how easily the power from
batteries can be transferred to magnetically
levitated trains.