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When a charged particle is fired with a velocity \( \vec{v} \) in
a region containing both electric field \( \vec{E} \) and
magnetic field \( \vec{B} \), it is not deflected from its straight line trajectory. Then
(1) \( \vec{v} \times \vec{E}=\vec{B} \)
(2) \( \vec{E} \times \vec{V}=\vec{B} \)
(3) \( \vec{B} \times \vec{v}=\vec{E} \)
(4) \( \vec{v} \times \vec{B}=\vec{E} \)
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