Question

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 $\overrightarrow{E}$ (vertically downwards) and a uniform magnetic field $\overrightarrow{B}$ (out of the plane of the figure) as shown. Then

• A. Electrons and protons with speed $\frac{|\overrightarrow{E}|}{|\overrightarrow{B}|}$ will pass through the slit
• B. Protons with speed $\frac{|\overrightarrow{E}|}{|\overrightarrow{B}|}$ 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

Answer 1

Answer: (C), (D)

The correct options are
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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