A stream of charged particles enter into a region with crossed electric and magnetic fields as shown in the figure below. On the other side is a screen with a hole that is right on the original path of the particles. Then,
  • A
    no particle can get through the hole
  • B
    all particles can get through the hole
  • Conly positively charged particles with speed $\frac{E}{B}$ can get through the hole
  • Dall particles with speed $\frac{E}{B}$ can get through the hole
KVPY 2009, Medium
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