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20. An electron having a charge e moves with a velocity \( v \) in X-direction. An electric field acts on it in Y-direction? The force on the electron acts in(a) positive direction of Y-axis(b) negative direction of \( Y \)-axis(c) positive direction of \( Z \)-axis(d) negative direction of Z-axis

Answer»

Answer: negative direction of Z-axis

Explanation: 
As electron moving in positive x-direction, so the current  is moving in negative x-direction ( the direction of your middle finger) and the magnetic field acts on positive Y-direction ( the direction of your index finger) then thumb will be in negative Z-direction which is the direction of force. 



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