Is Magnetic Field Work Always Zero in Current-Carrying Conductors?

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Homework Help Overview

The discussion revolves around the work done by magnetic fields in current-carrying conductors, particularly focusing on the scenario of two parallel wires and the implications of magnetic forces on work done during movement.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the conditions under which work is done by magnetic forces, questioning the assertion that magnetic force does no work. They discuss specific scenarios involving angles and the nature of forces acting on charges.

Discussion Status

There is an active exploration of differing viewpoints regarding the work done by magnetic forces. Some participants assert that work is being done, while others reference the perpendicular nature of magnetic forces to motion, leading to confusion about the validity of the book's claims.

Contextual Notes

Participants are grappling with the definitions and assumptions surrounding magnetic forces and work, particularly in the context of textbook statements versus their understanding of physics principles.

smatik
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Two straight current carrying conductors A and B are lying in a vertical plane as shown.The separation between them is h and mass per unit length of wires is λ.Keeping one wire fixed (say A),Bis raised by small hieght δh.
Q-1 What would be the work done by external agent?
Q-2 Will the work done by magnetic field zero?[Answer this question first. I m confused since i was told that the work done by magnetic force(just magnet force not Lorentz) is always zero.But the book says "Work done is non zero",i think the book's wrong]
 
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The book is right work is being done as F.ds is working .
In the case you are talking about F.ds the angle is 90 degree that's why no work done.
 
is the work done by magnetic force always zero??
 
See , when magnetic force acts on a charge , it doesn't change its speed , it just gives it centripetal acceleration . And direction of force is always perpendicular to motion .
I can say when ever Force is acting perpendicular to the motion of the body , work done is zero .
 

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