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Question: Answered & Verified by Expert
A stream of electrons and protons are directed towards a narrow slit in a screen (see figure). The intervening region has a uniform electric field (vertically downwards) and a uniform magnetic field $\mathbf{B}$ (out of the plane of the figure) as shown. Then
PhysicsMagnetic Effects of CurrentWBJEEWBJEE 2014
Options:
  • A electrons and protons with speed $\frac{|\mathrm{E}|}{|\mathbf{B}|}$ will pass through the slit
  • B protons with speed $|\mathrm{E}| /|\mathrm{B}|$ will pass through the slit, electrons of the same speed will not
  • C neither electrons nor protons will go through the sit irrespective of their speed
  • D electrons will always be deflected upwards irrespective of their speed
Solution:
2209 Upvotes Verified Answer
The correct answers are: neither electrons nor protons will go through the sit irrespective of their speed, electrons will always be deflected upwards irrespective of their speed
of their speed.


And electrons will always be deflected upwards irrespective of their speed.
So, (c) and (d) are correct options.

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