Find the EMF generated by a guitar string in the pickup coils

In summary, EMF stands for electromagnetic force and is a physical phenomenon created by an electrically charged object. In a guitar string and pickup coil, the string's movement through the pickup's magnetic field generates an electrical signal, which is amplified and heard as sound. The strength and direction of the magnetic field, number of coils, string material and thickness, and string vibration all affect the amount of EMF generated. EMF is measured in millivolts and can be altered by adjusting pickup position, using different types of pickups, and using effects pedals or other electronics. Different string materials and gauges can also affect the EMF signal.
  • #1
b1llso
1
0
Homework Statement
A string of acoustic guitar vibrates. The component of the magnetic field perpendicular to the area of a proximal amplifier coil is given by
B = 50.0 mT + (3, 20mT) sin (2π523t).
The circular amplifier coil has 30 turns and a radius of 2.70 mm. Find the induced EMF in the coil as a function of time.
Relevant Equations
B = 50,0 mT + (3, 20mT) sin(2π523t)
I tried using the general EMF equation but don't know how to apply it with the equation from the problem
 
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  • #2
Hi b1llso. Welcome to PF!

I am not sure what equation you are using. What is the law that you are applying?

Hint: You are given N and A for the coil and you are given the magnetic field B through the coil as a function of time t. What is dB/dt?

AM
 
  • #3
The answer they don't want: Zero

It's an Acoustic guitar and it uses Silk strings
...or Nylon ones.:wink:
 

1. How is EMF generated by a guitar string in the pickup coils?

When a guitar string vibrates, it creates a changing magnetic field around the pickup coils. This changing magnetic field induces an electric current in the coils, resulting in the generation of electromagnetic force (EMF).

2. What factors affect the EMF generated by a guitar string in the pickup coils?

The strength of the magnetic field, the distance between the string and the pickup coils, and the speed and amplitude of the string's vibrations all affect the EMF generated by a guitar string in the pickup coils.

3. How does the type of guitar string impact the EMF generated in the pickup coils?

The type of guitar string can impact the EMF generated in the pickup coils by changing the speed and amplitude of the string's vibrations. Different types of strings, such as steel or nylon, have different densities and tension, which can affect the string's vibration patterns.

4. Can the EMF generated by a guitar string in the pickup coils be measured?

Yes, the EMF generated by a guitar string in the pickup coils can be measured using specialized equipment, such as a multimeter or oscilloscope. The measurement will typically be in millivolts or microvolts.

5. How does the placement of the pickup coils affect the EMF generated by a guitar string?

The placement of the pickup coils can impact the EMF generated by a guitar string in multiple ways. If the coils are too far from the string, the EMF may be too weak to produce a strong signal. If the coils are too close, they may pick up interference from other sources. Additionally, the position of the coils along the string can also affect the EMF generated.

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