What factors contribute to the deflection of a galvanometer?

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Discussion Overview

The discussion revolves around the factors contributing to the deflection of a galvanometer, focusing on the relationship between the magnetic field and the coil's orientation. Participants explore the theoretical underpinnings of galvanometer operation, including the implications of a radial magnetic field.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant asserts that a radial magnetic field should result in no torque on the coil, questioning how deflection occurs under these conditions.
  • Another participant provides a link to a galvanometer example, suggesting that the design enhances the magnetic field and maintains a radial configuration.
  • A participant expresses confusion regarding the description of the magnetic field being radial, arguing that it should be perpendicular to the coil's area vector instead of parallel to its plane.
  • Another participant challenges the initial claim of no deflection, implying that there may be a misunderstanding in the original reasoning and offers an additional resource for clarification.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are differing interpretations of how the magnetic field interacts with the coil and its implications for deflection.

Contextual Notes

The discussion highlights potential misunderstandings regarding the definitions of radial magnetic fields and their effects on torque, as well as the specific design features of galvanometers that may influence their operation.

Sukuya
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In a galvanometer the magnetic poles are cut in such a fashion which ensures radial magnetic field. If field is radial then the angle between magnetic moment i.e Area vector of the coil and field is zero. Thus the coil should not experience any torque when current is passed through the coil. Then how come there is deflection.
 
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Yes, like this one. The link says :
"In the space between it and the pole pieces, where the coil moves freely, the soft iron cylinder makes the magnetic field stronger and radial such that into whatever position the coil rotates, the magnetic field is always parallel to its plane."

My doubt is that when field is radial it should be perpendicular to the area of coil rather than parallel to its plane.
 

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