Difference between F=qE and F=q(V*B)

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Discussion Overview

The discussion revolves around the differences between two force equations: F=qE, which describes the electric force, and F=q(V*B), which describes the magnetic force on a moving charge. The scope includes conceptual clarification of these forces in the context of physics principles.

Discussion Character

  • Conceptual clarification, Homework-related

Main Points Raised

  • Some participants explain that F=qE represents the electric force on a charge q in an electric field E.
  • Others note that F=q(V*B) describes the magnetic force on a charge q moving with velocity v in a magnetic field B, emphasizing that this equation involves a vector cross product.
  • A participant highlights that the magnetic force is perpendicular to both the velocity vector and the magnetic field vector.

Areas of Agreement / Disagreement

Participants generally agree on the definitions and contexts of the two forces, but the discussion does not delve into deeper implications or applications, leaving some aspects potentially unresolved.

Contextual Notes

The discussion does not address specific conditions under which these forces apply or any limitations in the definitions provided.

Who May Find This Useful

Students preparing for exams in physics, particularly those focusing on electromagnetism and force interactions.

XuFyaN
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what is the difference between these two forces ?

F=qE and F=q(V*B)
 
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The former is the expression for the electric force acting on an object of charge q placed in an electric field of field strength E, while the latter is the expression for the magnetic force acting on an object possessing charge q moving with velocity v in the region of a magnetic field with field strength B.
 
XuFyaN said:
what is the difference between these two forces ?

F=qE and F=q(V*B)
The first is just a vector relation for a charge in an electric field. The second is the Lorentz force on a moving charged particle in a magnetic field. The latter equation is a vector cross product, meaning that F is perpendicular to both the velocity vector and the magnetic field vector.

Bob S
 
thanks a lot..tomorrow is my exam and i wanted to study about these forces and their differences :)
 

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