A charged particle moves in a gravity-free space without change in velocity. Which of the follow...

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A charged particle moves in a gravity-free space without change in velocity. Which of the following is/are possible ?
(a) \( E=0, B=0 \)
(b) \( E=0, B \neq 0 \)
(c) \( E \neq 0, B=0 \)
(d) \( E \neq 0, B \neq 0 \)
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