An electron enters a region where magnetic field (B) and electric field (E) are mutually perpendicular, then(a) it will always move in the direction of B(b) it will always move in the direction of E(c) it always possesses circular motion(d) it can go undeflected also
Answers
Answer:
D) it can go undeflected also
Explanation:
If the magnetic force balances the electric force then electron can go undeflected.
We also know that : Fnet = F(electric) + F(magnetic)
q E =q( v × B )
However it can never always move in direction of B since magnetic force acts perpendicular to the motion.
Since there is magnetic field also present therefore, it will not only move in the direction of E.
Due to presence of E circular motion cannot occur.
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An electron enters a region where magnetic field it can go undeflected also.
Explanation:
If the magnetic force balances the electric force then electron can go undeflected.
q E=q( v × B )
When electrons enter in a region where there is only magnetic field, then force exerted by the magnetic field will deflect the electron in a direction perpendicular to its motion and also perpendicular to the magnetic field.
Whereas in the presence of electric field, force exerted by the electric field is in a direction opposite to the direction of electric field.
As a result, electron deflected by magnetic field is nullified by the deflection by electric field. As a result, electron moves undeflected.
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