CBSE Class 12-science Answered

Dear Student

Electric field near a charged infinitely extended surface  E=Sigma/(2ε₀)

Sigma=Surface Charge density

ε₀ = Permity of vacuum

So, force acting on the projected electron  F = Ee

Acceleration of the electron  a =  F/m_e

m_e= Mass of  electron

Initial velocity of the 150ev electron= u= (2XeX150/m_e)= (300e/m_e)

Final velocity = V=0

V=u-at==> t= (u/a)

u/a=

The required distance = S= ut+1/2   a  t²    this implies S=6X150/E

I did't get the surface density provided in the problem.

Just plug in the numbers yu ocan get S

Regards

Team

Topperlearning