What is the relationship between induced emfs and circuit shape in a solenoid?

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The discussion centers on the relationship between induced electromotive force (emf) and circuit shape in a solenoid. It posits that if a circuit encircles a long solenoid generating a 360 V induced emf, the induced voltage can be approximated as 1 V per degree of circuit angle. However, the shape of the circuit does influence the induced emf, particularly due to self-inductance effects, and the resistance must be sufficiently high to minimize induced current. The conversation highlights a need for improved teaching methods regarding these concepts in introductory physics courses. Understanding these principles is crucial for accurately analyzing circuits in varying configurations around solenoids.
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So if a circuit goes once around an extremely long solenoid whose changing current causes an induced emf of 360 V (in the circuit) at a particular time, does that mean that regardless of the shape of the circuit, the induced emf will be 1 V per degree? If the circuit has only one resistor whose beginning and end make a 1 degree angle with the center of the solenoid, does that mean that the potential difference across that resistor is 359 V at that moment in time?
 
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That's right, provided the circuit path is close to the solenoid relative to its length.

[edit]... another qualifier, the resistance needs to be high enough so that the induced current is insignificant. There's a self inductance effect in the circuit, and for that calculation, shape DOES matter.
 
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jambaugh said:
That's right, provided the circuit path is close to the solenoid relative to its length.

[edit]... another qualifier, the resistance needs to be high enough so that the induced current is insignificant. There's a self inductance effect in the circuit, and for that calculation, shape DOES matter.
Oh ya! I didn't think about self-inductance; I think that's the next thing I learn about. Thank you.

This should be taught better in 1st year physics courses.
 
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