Magnitude of force on charged particle

AI Thread Summary
The discussion centers on the force experienced by a charged particle moving in a magnetic field, specifically using the equation F = BqV. Participants clarify that the original vector equation for this force is F = q(v x B), where v x B represents the cross product of velocity and magnetic field. The cross product is determined to be zero in the given problem, indicating no force acts on the particle. The conversation emphasizes understanding the vector nature of the force and its dependence on the angle between the velocity and magnetic field vectors. This highlights the importance of vector analysis in physics problems involving charged particles in magnetic fields.
Cici2017

Homework Statement


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Homework Equations

The Attempt at a Solution


I know the equation of force on a moving charge in a magnetic field is F=BqV...
Why is the answer A ?
 
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Cici2017 said:
I know the equation of force on a moving charge in a magnetic field is F=BqV...
What is the original vector equation for this force?
 
cnh1995 said:
What is the original vector equation for this force?
F=qvBsinθ ?
 
Cici2017 said:
F=qvBsinθ ?
Yes. It's actually q(vxB), where vxB is the cross product of v and B.
What is the cross product of v and B in this problem?
 
cnh1995 said:
Yes. It's actually q(vxB), where vxB is the cross product of v and B.
What is the cross product of v and B in this problem?
0?
 
Cici2017 said:
0?
Yes.
 
cnh1995 said:
Yes.
Thank you!
 

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