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Solution


Q.

An electron moves with a speed v along positive direction of the x-axis. If a magnetic field B acts along the positive y-direction, then the force on the electron will act along:
1 x-axis  
2 y-axis  
3 −vez-direction  
4 +vey-direction  

Ans.

(3)

As the electron is moving in positive x-direction, according to Maxwell's right-hand thumb rule, the current is moving in negative x-direction and the magnetic field acts along positive y-direction.

By applying Fleming's left-hand rule, the thumb will be in negative z-direction, which is the direction of force.