A Rectangle Parallel to a Magnetic Field

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Homework Help Overview

The discussion revolves around the behavior of a rectangle placed parallel to a magnetic field, specifically examining the forces and torques acting on it due to magnetic interactions. The subject area includes concepts from electromagnetism, particularly the magnetic force on charged particles and current-carrying conductors.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between the magnetic force and the orientation of the rectangle relative to the magnetic field, questioning the assumptions about net force and torque. There are discussions about the implications of the cross product in the context of magnetic forces and inquiries about the variables involved in the relevant equations.

Discussion Status

Some participants have provided insights into the nature of the magnetic force and its perpendicular relationship to the magnetic field. There is an ongoing exploration of different perspectives regarding net forces and torques, with some participants affirming certain assumptions while others seek clarification on specific terms and formulas.

Contextual Notes

Participants are navigating through various interpretations of the magnetic force equations and their implications for the scenario described. There is mention of different formulas applicable to currents, indicating a potential complexity in the problem setup.

aximwolf
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Homework Statement



file:///Users/LabGuest/Desktop/CH26.tiff

Homework Equations



FB= qv cross B

The Attempt at a Solution




If the the rectangle is parallel to the magnetic field and we know that FB is perpendicular to the B field itself than there should be a net Torque but no net force. Is this assumption correct?

My first intuition was to say there was a net force and no net torque but I think that is wrong because magnetic force acts perpendicular to the magnetic field (B).
 

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aximwolf said:
[

The Attempt at a Solution




If the the rectangle is parallel to the magnetic field and we know that FB is perpendicular to the B field itself than there should be a net Torque but no net force. Is this assumption correct?


Yes, it is correct. Can you explain, why?

ehild
 
Yes because Magnetic Force = qv cross B thus it acts perpendicular to the magnetic field (B) since it is a cross product. The magnitude of the force is qvbsin(theta).
 
But then there can be a net force on the rectangle, perpendicular to it, is it right?

What is v in the formula?

ehild
 
Last edited:
there is a different formula (derived from the formula u wrote) used in case of currents ... do you know it?
 
I would consider the magnetic force on each segment of the loop and sum these.
 
WatermelonPig said:
I would consider the magnetic force on each segment of the loop and sum these.

correct way ! :approve:
 

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