Cathode-ray tube: Error in a book?

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belyi00
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Hello. I was studying magnetism with the 9th edition of the Serway book and I think that I've found a mistake. In the cathode ray tube example (one of the uploaded pictures) it is said that the force acting on a electron goes downward, but using both right hand rules that they provide in the book - all I understand is that it goes upward. The right hand rules are in the uploaded pictures too. Can anyone help me with this?
 
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  • Textbook Example 29.1 with a 3D diagram (Figure 29.6) of an electron moving along the x axis toward a tube, with velocity v, magnetic field B at 60 degrees in the xy plane, and magnetic force F_B pointing downward along negative z; solution text gives F_B = |q|vB sin θ = 2.8 × 10^-14 N.
    tube.png
    59 KB · Views: 672
  • Two right-hand rule diagrams for magnetic force on a positive charge: (a) thumb points along force, fingers curl from v to B; (b) palm pushes in direction of force, fingers along v, thumb along B.
    rule.png
    26.9 KB · Views: 618

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