A charged particle would continue to move with a constant velocity ...
A charged particle would continue to move with a constant velocity in a region wherein,
\( \mathrm{P} \)
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(a) \( \mathbf{E}=0, \mathbf{B} \neq 0 \).
(b) \( \mathbf{E} \neq 0, \mathbf{B} \neq 0 \).
(c) \( \mathbf{E} \neq 0, \mathbf{B}=0 \).
(d) \( \boldsymbol{E}=0, \boldsymbol{B}=0 \).
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