A) E is parallel to \[\upsilon .\] but perpendicular to B
B) E and B both are parallel to \[\upsilon .\]
C) E and B are perpendicular to each other
D) E B and v are perpendicular to one another and \[\upsilon =\frac{E}{B}\]
Correct Answer: D
Solution :
Since, proton is undecflected, therefore net force on it is zero \[F=q\overrightarrow{E}+q(\overrightarrow{v}\times \overrightarrow{B})=0\] \[=q\overrightarrow{E}=-q(\overrightarrow{v}\times \overrightarrow{B})\]In this condition, E, B and\[\upsilon \]are perpendicular to one another
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