A) \[\frac{|\vec{E}|}{|\vec{B}|}\]
B) \[\vec{E}\times \vec{B}\]
C) \[\frac{|\vec{B}|}{|\vec{E}|}\]
D) \[\vec{E}.\vec{B}\]
Correct Answer: A
Solution :
| [a] For electron to pass undeflected, electric force on electron |
| = magnetic force on the electron |
| \[i.e.,\] \[eE=evB\] |
| or \[v=\frac{E}{B}\] |
| or \[v=\frac{|\vec{E}|}{|\vec{B}|}\] |
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