if an electron is not deflected in passing through a certain space,can we be sure that there is no magnetic feild in that region?

Dear Aditya

Deflection depends on VXB.So if v and b are in same direction then electron will go undeflected even if there is magnetic field(B).

All the best.

AKASH GOYAL

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no we can not say that there is no magnetic feild....

take a example in which electron is passing through a region where, magnetic field and electric field exist ,both are perpendicular to each other as well as to velocity of particle...

 v is the velocity of moving electron then

force due to  electric field is F_e = Eq

 Force due to magnetic field is q(vBsin@) or qvB                      (sin90 =1)

  if electron is not deflected then total force acting must be zero

          qvB=qE

           v=E/B....1

that means if there is magnetic field then electron is not deviated but this condition 1 should be fulfilled....

Approved