An electron initially at rest is accelerated in a vacuum through a potential difference of 1000V. The electron travels through the electric field set up by two parallel planes (Length =40 mm, separation = 20mm). The top plate is kept at a positive potential of 200V while the bottom plate is grounded. The electron gets deflected at an angle ϴ to the original direction (see figure) and emerges from the electric field at P. It then strikes a fluorescent screen (a) Find the velocity of the electron just before it enters the parallel plates (at R) (b) Find the time taken for the electron to travel from R to P (c) Find the vertical acceleration of the electron and its velocity as it leaves P
An electron initially at rest is accelerated in a vacuum through a potential difference of
1000V. The electron travels through the electric field set up by two parallel planes
(Length =40 mm, separation = 20mm). The top plate is kept at a positive potential of
200V while the bottom plate is grounded. The electron gets deflected at an angle ϴ to the
original direction (see figure) and emerges from the electric field at P. It then strikes a
fluorescent screen
(a) Find the velocity of the electron just before it enters the parallel plates (at R)
(b) Find the time taken for the electron to travel from R to P
(c) Find the vertical acceleration of the electron and its velocity as it leaves P
(d) Does the electron travel in a straight line after it leaves P? Why?
(e) If the time taken for the electron to travel from R to P is half the time it takes to travel
from P to screen, find the distance of the screen from the parallel plates
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