anonymous
  • anonymous
In which direction does a magnetic force act on an electron that is moving in the positive x-direction in a magnetic field pointing in the positive z-direction? A) any direction in the xy-plane B) the negative y-direction c) the negative x-direction D) the positive y-direction a particle with charge q is at rest when a magnetic field is suddenly turned on. The field points in the z-direction. What is the direction of the net force acting on the charged particle? a) In the z-direction. b) There is no force on the particle. c) In the y direction d) In the x direction
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
The direction of magnetic force is the same as vextor v x B direction. It follows right hand rule, so postive x X positive z = negative y direction. F=qE. The force direction follows magnetic field E direction. Hence a)
ghazi
  • ghazi
\[F=q*(V*B)\] take the cross product of the movement of electron and applied magnetic field
anonymous
  • anonymous
there is no force acting on the particle in the second question as the magnetic force acts only on those particles which are in motion.

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anonymous
  • anonymous
use right hand rule
anonymous
  • anonymous
@AERONIK : the magnetic force is changing (from zero then turned on).
anonymous
  • anonymous
i did the right hand rule for the first one and got neg y as well. for the 2nd question, is it b? no net force?
anonymous
  • anonymous
Actually yes I think its B

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