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An electron is moving along positive x-axis. A uniform electric field exists towards negative y-axis. What should be the direction of magnetic field of suitable magnitude so that net force of electron is zero.
  • a)
    Positive z-axis
  • b)
    Negative z-axis
  • c)
    Positive y-axis
  • d)
    Negative y-axis
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
An electron is moving along positive x-axis. A uniform electric field ...
Negative zDue to electric field force is in positive y directonfor net force zero on electron force due to magnetic field must be in negative y direction direction of magnetic field is in negative z direction
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Community Answer
An electron is moving along positive x-axis. A uniform electric field ...
Let the velocity of the electron is v
Then
If the electric field is E then
Lorentz Force
or,
For force to be zero
or,
To get the RHS in the direction of , B should be acting in the direction of  . As we know that
Therefore the direction of the magnetic field must be in the negative z-axis.
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