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Q.
A charged particle moves in a gravity free space without change in velocity. Which of the following is not possible in that space?
Moving Charges and Magnetism
Solution:
If $\vec{E} \neq 0$ and $\vec{B} \neq 0, \vec{E}$ will definitely deflect / increase / decrease velocity of charge. If both $\vec{E}$ and $\vec{B}$ are non zero, they may balance each other.