ELECTROMAGNETISM-torque on a current coil

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Homework Help Overview

The discussion revolves around calculating the maximum torque on a circular coil in a magnetic field, specifically focusing on the parameters of the coil, including the number of turns, radius, current, and magnetic induction. The subject area is electromagnetism.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply a formula for torque on a coil and questions the appropriateness of assuming the angle for maximum torque is zero. Some participants raise concerns about the definition of the angle used in the torque calculation.

Discussion Status

The discussion is exploring different interpretations of the angle in the torque formula and its implications for calculating maximum torque. Participants are clarifying definitions and units related to torque, with some guidance provided on standard units.

Contextual Notes

There is a mention of the angle being defined differently by participants, which may affect the understanding of the torque calculation. The original poster also seeks clarification on the unit of torque.

jsalapide
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A circular coil of 50 turns has a radius of 0.2m and carries a current of 5A. The coil is in a field where the magnetic induction is 0.6 Web/m^2. What is the max torque on the coil?

I used the formula for the torque on a coil: r=NBIAcos(theta)
I assume that the angle for max torque is 0
my answer is 6pi..

is that right?
is it ok to let the angle be 0??
 
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Looks OK to me.

I'm not sure how you defined your angle theta. Usually it's defined as the angle between the area vector (normal to the plane of the coil) and the magnetic field, in which case the torque is given by μ X B = NIAB sin(theta). Using that definition, the torque is maximum when theta = 90 degrees.
 
Ah.. my theta is the angle between the plane of the coil and the field

anyways,, thanks..

how about the unit? Is it web-A?
 
jsalapide said:
how about the unit? Is it web-A?
The standard unit for torque is Newton-meter (which is equivalent to web-A).
 

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