A charged particle enters into a gravity free space occupied by an electric field \( \mathbf{E} ...

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A charged particle enters into a gravity free space occupied by an electric field \( \mathbf{E} \) and magnetic field \( \mathbf{B} \) and it comes out without any change in velocity. Then, the possible cases may be
(a) \( \mathbf{E}=0 \) and \( \mathbf{B} \neq 0 \)
(b) \( \mathbf{E} \neq 0 \) and \( \mathbf{B}=0 \)
(c) \( \mathbf{E} \neq 0 \) and \( \mathbf{B} \neq 0 \)
(d) \( \mathbf{E}=0, \mathbf{B}=0 \)
\( \mathrm{P} \)
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