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An electron is moving along the positi...

An electron is moving along the positive x-axis . A uniform electric field exists towards negative y-axis. What should be the direction of a magnetic field of suuitablw magnitude so the net force on electron is zero ?

A

positive z- axis

B

negative z-axis

C

positive y-axis

D

negative y-axis

Text Solution

Verified by Experts

The correct Answer is:
A
Velocity of electron`=v hati`
Magnetic field `=-Bhatj`
Force by Magnetic field `=q(vecVxxvecB)=-e(hatixxvecB(-hatj))=(evB)hatk`
Hence, Electric field should be along positive z axis.
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