1.

Write the condition under which can electron will move undeflected in the presence of crossed electric and magnetic fields.

Answer»

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  



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