Magnetic Force, Electric Force

AI Thread Summary
A positively charged particle moving in the positive x direction through a uniform magnetic field in the positive z direction experiences a magnetic force in the negative y direction. To achieve a net force of zero, an electric field must be applied in the negative y direction, counteracting the magnetic force. The original poster believes the textbook answer of applying an electric field in the positive y direction is incorrect. The discussion highlights confusion over the direction of forces and the application of the right-hand rule. Ultimately, the consensus leans towards the need for an electric field in the negative y direction to balance the forces.
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Homework Statement


24. A uniform magnetic field is in the positive z direction. A positively charged particle is moving in the positive x direction through the field. The net force on the particle can be made zero by applying an electric field in what direction?
A. Positive y
B. Negative y
C. Positive x
D. Negative x
E. Positive z


Homework Equations



F = q* (vxB)
F = q*E

The Attempt at a Solution



The answer for this problem is given and in my book it's given as B. However, I keep getting A. I don't know where I'm going wrong.

So if the positive particle is moving in the positive x-direction and the B-field is in the positive z direction, then the resulting magnetic force is in the negative y-direction. And if we want a net force of zero on this positive particle, then it seems like if we apply an electric field in the positive y direction then we could get the net zero force that we're looking for. Is this an incorrect explanation?
 
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I agree with you. I think the book is wrong. Anyone else?
 

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