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An electron and a proton are moving on straight parallel paths with same velocity. They enter a semi infinite region of uniform magnetic field perpendicular to the velocity. Which of the following statement(s) is true?

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They will come out at different times

The will come out travelling along perpendicular paths

They will come out at the same time

They will never come out of the magnetic field region

answer is D.

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Detailed Solution

For any charged particle moving in a uniform magnetic field,

$T = \frac{2 π m}{B q} \Rightarrow T \propto m$

$∴ T_{e} < T_{p}$

So, the two particles will come out are different times.

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