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A stream of electrons and protons are di...

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 `vecB` (out of the plane of the figure) as shown. Then

A

electrons and protons with speed `(|vecE|)/(|vecB|)` will pass through the slit.

B

protons with speed `(|vecE|)/(|vecB|)`will pass through the slit, electrons of the same speed will not

C

neither electrons nor protons will go through the slit irrespective of their speed.

D

electrons will always be deflected upwards irrespective of their speed.

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