| A particle with a specific charge s is fired with a speed v towards a wall at a distance d, perpendicular to the wall. |
| What minimum magnetic field must exist in this region for the particle not to hit the wall? |
A) \[\frac{V}{sd}\]
B) \[\frac{2V}{sd}\]
C) \[\frac{V}{2sd}\]
D) \[\frac{V}{4sd}\]
Correct Answer: A
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