How Do Moving Conductors and Coils Interact with Magnetic Fields?

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SUMMARY

The discussion focuses on the interaction of moving conductors and coils with magnetic fields, specifically in the context of a moving-coil loudspeaker and a rotating copper disc. The coil, with a diameter of 30mm and 800 turns, experiences a force when a current of 12mA flows through it in a magnetic field of 0.5T. Additionally, when a long straight conductor moves perpendicularly through a uniform magnetic field, it induces a current, as indicated by the deflection on an ammeter. The calculation of electromotive force (e.m.f) for a rotating copper disc in Earth's magnetic field is also addressed, requiring the application of Faraday's Law.

PREREQUISITES
  • Understanding of Faraday's Law of Electromagnetic Induction
  • Knowledge of magnetic fields and forces on current-carrying conductors
  • Familiarity with basic electrical concepts such as current and resistance
  • Ability to perform calculations involving e.m.f and magnetic flux
NEXT STEPS
  • Study Faraday's Law and its applications in electromagnetic induction
  • Learn about the forces on current-carrying conductors in magnetic fields
  • Explore the principles of moving-coil loudspeakers and their operation
  • Investigate the calculation of e.m.f in rotating systems and its practical applications
USEFUL FOR

Students and educators in physics, electrical engineers, and anyone interested in the principles of electromagnetism and their applications in technology.

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Homework Statement



1) The coil of a moving-coil loudspeaker has a mean diameter of 30mm and is wound with 800 turns.It is situated in a radial magnetic field of 0.5T. Calculate the force on the coil, in Newtons, when the current is 12mA.

2)Explain what happens when a long straight conductor is moved through a uniform magnetic dirld at constant velocity.Assume that the conductor moves perpendicularly to the field.If the ends of the conductor are connected together through an ammeter, what will happen?

3)A copper disc,250mm in diameter, is rotated at and prependicular to its plane. If the axis points magnetic north and south, calculate the e.m.f between the circumference of the disc and the axis. Assume the horizontal component of the Earth's field to be 18uT.

Homework Equations





The Attempt at a Solution



i don't know how to calculate the above questions.but i try to solve Q2 as the follow,please give me some advice and solution,thanks

Q2 ans. A deflection was obtained on ammeter,when the direction of moving of conductor was reversed,ammeter was also deflected in the reversed direction.
 
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Physics news on Phys.org
The first question you have a solenoid, have you learned what to do with these?

The second you are right.

The third question requires Faraday's Law.

Try it out.
 

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