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  • A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure 13.3. In the field an electron and a proton move as shown. The electron and the proton experience (a) forces both pointing into the plane of paper (b) for

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure 13.3. In the field an electron and a proton move as shown. The electron and the proton experience
(a) forces both pointing into the plane of paper
(b) forces both pointing out of the plane of paper
(c) forces pointing into the plane of paper and out of the plane of paper, respectively
(d) force pointing opposite and along the direction of the uniform magnetic field respectively
    

Answers (1)

Answer: A
Solution:

We know that direction of current will be in the direction of positive charge flow.
As the electron is coming downward, we can assume the corresponding current will be moving upward.
Similarly the motion of proton in upward direction will cause corresponding current in upward direction.
Hence both the particles will have correspond current in same direction which is upward.
By using Flemings left hand rule we can say that force on proton as well as electron will be in the direction into the plane of paper.

Therefore correct option of this question is option A   

 

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