An electron travels through a region of space with no acceleration. Which one of the following s...

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An electron travels through a region of space with no acceleration. Which one of the following statements is the best conclusion?
(A) Both \( E \) and \( B \) must be zero in that region
(B) \( E \) must be zero, but \( B \) might be non-zero in that region
(C) \( E \) and \( B \) might both be non-zero, but they must be mutually perpendicular
(D) \( B \) must be zero, but \( E \) might be non-zero in that region
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