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Questions and Answers
In which planes do eddy currents flow within conductors?
In which planes do eddy currents flow within conductors?
- Parallel to the magnetic field
- In the direction of the magnetic field
- At an angle to the magnetic field
- Perpendicular to the magnetic field (correct)
What causes the induction of eddy currents within conductors?
What causes the induction of eddy currents within conductors?
- Changing magnetic field (correct)
- Static magnetic field
- Electric field
- Varying electric potential
What is the relationship between the magnitude of the eddy current and the strength of the magnetic field?
What is the relationship between the magnitude of the eddy current and the strength of the magnetic field?
- Inverse
- No relationship
- Exponential
- Proportional (correct)
How do eddy currents react to the source of the magnetic field?
How do eddy currents react to the source of the magnetic field?
What is the purpose of eddy current brakes?
What is the purpose of eddy current brakes?
Flashcards
Eddy Current Plane
Eddy Current Plane
Eddy currents flow in planes that are at right angles (90 degrees) to the magnetic field.
Cause of Eddy Currents
Cause of Eddy Currents
A changing magnetic field near a conductor induces circular electric currents within the conductor.
Eddy Current Magnitude
Eddy Current Magnitude
The stronger the magnetic field that's changing, the larger the induced eddy current will be.
Eddy Current Reaction
Eddy Current Reaction
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Eddy Current Brakes
Eddy Current Brakes
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Study Notes
Eddy Currents in Conductors
- Eddy currents flow within the bulk of conductors, circulating in closed loops perpendicular to the applied magnetic field.
- They typically circulate in planes that are parallel to the cross-section of the conductor.
Induction of Eddy Currents
- The induction of eddy currents within conductors is caused when a conductor experiences a changing magnetic field, according to Faraday's law of electromagnetic induction.
Relationship with Magnetic Field Strength
- The magnitude of the eddy current is directly proportional to the strength of the magnetic field; stronger magnetic fields induce larger eddy currents.
Reaction to Magnetic Field
- Eddy currents generate their own magnetic fields in response to the source magnetic field, often opposing the change that created them, in accordance with Lenz's law.
Purpose of Eddy Current Brakes
- Eddy current brakes utilize the principles of electromagnetic induction to provide non-contact braking by creating opposing forces through induced currents in conductive materials, commonly used in trains and roller coasters for efficient deceleration.
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