Why Does Torque Change in a Rotating Coil Even if the Force Remains Constant?

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Homework Help Overview

The discussion revolves around the concept of torque in the context of a rotating coil within a magnetic field. Participants are exploring why torque changes even when the force applied remains constant, focusing on the relationship between force, distance from the pivot, and the lever arm in torque calculations.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to understand the relationship between torque and the changing distance from the pivot point, despite the force being constant. Questions are raised about the definition of torque and the role of the lever arm in its calculation.

Discussion Status

The discussion is ongoing, with some participants seeking further clarification on the concepts involved. There is an acknowledgment of the distinction between force and the lever arm in the context of torque, suggesting a productive exploration of the topic.

Contextual Notes

Participants are grappling with the definitions and relationships in torque calculations, indicating a need for clearer understanding of the underlying physics principles. There is a focus on the implications of changing distances in the context of a rotating system.

delsoo
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Homework Statement



for this question, since area of cutting of magnetic field change, so magnetic flux change, f is unchanged . but i don't understand why the torque will change since the force is unchanged, since torque=FORCE X DISTANCE FROM THE ROTATING PIVOT

Homework Equations





The Attempt at a Solution

 

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Distance between the line of action of the force and the pivot is changing.
 
Can you explain.further. I can't see and understand the situation.
 
delsoo said:
but i don't understand why the torque will change since the force is unchanged, since torque=FORCE X DISTANCE FROM THE ROTATING PIVOT

Careful. Torque is generally not equal to the product of the force, F, and the distance, r, between the axis of rotation and the point of application of the force. As dauto is pointing out, torque is the product of force and "lever arm", d.
 

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