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

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In summary, the induced emf in a circuit going once around a long solenoid with changing current is 360V at a specific time, regardless of the circuit's shape. However, the potential difference across a resistor in the circuit, which makes a 1 degree angle with the solenoid's center, would be 359V at that moment, provided the circuit's path is close to the solenoid's length and the resistance is high enough to make the induced current insignificant. It should be noted that shape does matter when considering self-inductance effects in the circuit. This concept should be taught more thoroughly in introductory physics courses.
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TheLil'Turkey
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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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  • #3
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.
 

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

1. What is induced emf?

Induced emf, or electromotive force, is a voltage that is generated in a conductor when it is exposed to a changing magnetic field. This phenomenon is known as electromagnetic induction.

2. How is induced emf different from regular emf?

Regular emf is generated by a battery or power source, while induced emf is generated by a changing magnetic field. Induced emf only occurs while the magnetic field is changing, whereas regular emf can be maintained constantly.

3. What is the relationship between induced emf and Faraday's Law?

Faraday's Law states that the magnitude of the induced emf is equal to the rate of change of magnetic flux through a conductor. In other words, the faster the magnetic field changes, the stronger the induced emf will be.

4. How can induced emf be used in practical applications?

Induced emf has many practical applications, such as in generators, transformers, and motors. It can also be used in wireless charging and electromagnetic braking systems.

5. What factors affect the strength of induced emf?

The strength of induced emf is affected by the rate of change of the magnetic field, the number of turns in the conductor, and the strength of the magnetic field. Additionally, the material and shape of the conductor can also influence the induced emf.

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