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Magnetism

Section: Physics

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Question : 40 of 48

Marks: +1, -0

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 statements(s) is/are true?

[JEE Adv 2011 P1]

They will never come out of the magnetic field region.
They will come out travelling along parallel paths.
They will come out at the same time.
They will come out at different times.

Solution:

Both particles move in semi-circular paths and finally, emerge out of

\overset{\rightarrow}{B}

. For a semicircle, we have

\frac{T}{2}

=

\frac{\pi m}{q B}

Since

m_p

>

m_e

, the electron particle takes lesser time to come out.

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