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Electricity and Magnetism

By Science

Explore the invisible forces behind magnets, power lines and scrapyard cranes, from familiar conductors to superconductors.

Electricity and Magnetism

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Sample questions

  1. Which particles carry the moving electric charge in an ordinary copper wire?
  2. In its superconducting state, what is a material's electrical resistance to steady direct current?
  3. What does a step-down transformer reduce in an AC power system?

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