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Byju's Answer

Standard XII

Physics

Potential Energy - External Viewpoint

A proton ente...

Question

A proton enters from left to right into a region of constant magnetic field coming out of the page. In what direction will the electron move once it enters the field?

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Solution

The correct option is B Move down

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Q. A particle of mass

m

and charge

q

enters with velocity

v_{0}

perpendicular to a magnetic field B (coming out of the plane of the paper) as shown in the figure. It moves in the magnetic field for time

t = \frac{π m}{4 q B}

, and then enters into a constant electric field region. The electric and magnetic fields are present only in a rectangular region of thickness

d

. The length of rectangular region is

l

. The particle enters parallel to and grazing the side

R Q

and leaves the region at

P

Given :

v_{0} = (\sqrt{2} + 1) m s^{- 1}

\frac{E}{B} = 8 m s^{- 1}, l = ∣ ∣ ∣ \frac{4 \sqrt{2}}{5} v_{0} ∣ ∣ ∣

metres and

\frac{m}{q B} = \frac{4}{5}

Displacement of the particle in x-direction before it enters in the electric field is

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