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```				   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?
```

6 years ago

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```										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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```
6 years ago
```										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 Fe = 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....

```
6 years ago

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