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Magnetic Force, Electric Force

  • Thread starter eprparadox
  • Start date
  • #1
138
2

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?
 

Answers and Replies

  • #2
phyzguy
Science Advisor
4,370
1,345
I agree with you. I think the book is wrong. Anyone else?
 

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