Question

Write the condition when electron passes undeflected from cross electric and magnetic field

Answer 1

The electron will move undeflected in the presence of crossed electric and magnetic field if the electric force on the electron is balanced by the magnetic force acting on the electron ,

Mathematically q E = q V B

Where q - charge

E - electric field

B - magnetic field

V - velocity of the electron

In the given problem q = v (charge on electron )

e E = eVB