A charged particle goes undeflected in a region containing electric and magnetic field. It is po...

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A charged particle goes undeflected in a region containing electric and magnetic field. It is possible that
(a) \( \vec{E}\|\vec{B}, \vec{v}\| \vec{E} \)
(b) \( \vec{E} \) is not parallel to \( \vec{B} \)
(c) \( \vec{v} \| \vec{B} \) but \( \vec{E} \) is not parallel to \( \vec{B} \)
(d) \( \vec{E} \| \vec{B} \) but \( \vec{v} \) is not parallel to \( \vec{E} \).
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