Practice question · Select all that apply
Select every statement that is TRUE about electromagnetism.
Hints
- Two of these are the pitfalls the lesson explicitly names.
- One misstates the inverse-square law; the other forgets that induction needs change.
Show the answer
- A. Radio waves and X-rays differ from visible light only in frequency
- C. Moving charges create magnetic fields
- D. Visible light is one narrow band of the electromagnetic spectrum
Why
Maxwell's equations predict electromagnetic waves at the speed of light and identify light itself as one, with radio and X-rays differing only in frequency; moving charges do create magnetic fields. Option 2 halves what should be quartered, and option 2 forgets that only a changing field induces.
Practise Electromagnetism
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