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A charged particle moves in a gravity-free space
without change in velocity. If \( \vec{E} \) and \( \vec{B} \) represents the electric and magnetic field respectively, this region may have
(1) \( \vec{E}=0 ; \vec{B} \neq 0 \)
(2) \( \overrightarrow{\mathrm{E}} \neq 0 ; \overrightarrow{\mathrm{B}} \neq 0 \)
(3) \( \vec{E} \) and \( \vec{B} \) are inclined at \( 45^{\circ} \) with each other
(4) Both (1) and (2)
\( \mathrm{P} \)
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