Electron chapter class 12 Note

 •Motion of electron inside the electric field.

Let us censi consider, electron entering with the velocity cu' horizontally between the electric field having intensity 'E' then.

E= Pd/ distance 

.:. E=v/d

When the electron enters inside the electric field, it is attracted by +ve plate so, there is a vertical force but no any horizontal force so,

Vertical force (F) = eE

Or, ma= eE

or, a= eE/m ........(1)

         

                     This acceleration is vertical.

And,

Horizontal acceleration (o2): 0 (Horizontal force =(0) 

Let the electron reach of a point p(x y) after a time (t) .Then, we have,

 S= ut + 1/2 * a * t ^ 2

Soo. Starting 

x = ut + 1/2 * a* t ^ 2

x = ut + 0

x = ut

.:. t = x / u .........(2)

Likewise,

 y = u base y t + 1/2 a base y *t ^ 2