Biot-Savard Law: Find Magnetic Field at Center of Loop

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In summary, this problem involves finding the magnetic field at the center of a circular loop of radius a with current I flowing in the direction of the x-axis. The integrated Biot-Savart law is the method to use, and the correct expression is (mu_0IL)/(4pia^2), where mu_0 is the permeability constant. This expression can be simplified by noting that L = 2pi a. However, there may be other factors to consider depending on the specific setup of the problem.
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lemaire
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Homework Statement




A single piece of wire is bent so that it includes a circular loop of radius a. A current I flows in the direction of the x-axis . Find an expression for the magnetic field at the center of the loop.

Homework Equations





The Attempt at a Solution


This is a problem involving the integrated Biot-Savard law
 
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  • #2
lemaire said:
This is a problem involving the integrated Biot-Savard law
You are correct, the Biot-Savart law is the way to go.
 
  • #3
well i can't find the right expression.
 
  • #4
lemaire said:
well i can't find the right expression.
What have you tried?
 
  • #5
this is what i have: (mu_0IL)/(4pia2) with a being the radius and mu_0 being the permeability constant
 
  • #6
lemaire said:
this is what i have: (mu_0IL)/(4pia2) with a being the radius and mu_0 being the permeability constant
Looks correct to me. However it can be simplified by noting that [itex]L = 2\pi a[/itex].
 
  • #7
well i am using a web software and the response you and i agreed on is not the right one. In the picture, the current I comes from the left in the x-axis goes in a circular motion and continues in the x-axis again.
 

1. What is the Biot-Savart Law?

The Biot-Savart Law is a fundamental equation in electromagnetism that describes the relationship between an electric current and the magnetic field it produces. It is used to calculate the magnetic field at a specific point in space due to a current-carrying element, such as a wire or loop.

2. How is the Biot-Savart Law derived?

The Biot-Savart Law is derived from the principles of classical electromagnetism and the Lorentz force law. It states that the magnetic field at a point is directly proportional to the current at that point and inversely proportional to the distance from the current element.

3. What is the formula for the Biot-Savart Law?

The Biot-Savart Law is expressed as B = μ₀I/(4πr) x sinθ, where B is the magnetic field, μ₀ is the permeability of free space, I is the current, r is the distance from the current element, and θ is the angle between the current element and the point where the magnetic field is being calculated.

4. How is the Biot-Savart Law used to find the magnetic field at the center of a loop?

To find the magnetic field at the center of a loop, the Biot-Savart Law formula can be used by breaking the loop into smaller current elements, calculating the magnetic field at the center of each element, and then summing them together to find the total magnetic field at the center of the loop.

5. What are the applications of the Biot-Savart Law?

The Biot-Savart Law is used extensively in various fields, including electromagnetism, physics, and engineering. It is used to design electromagnets, motors, and generators, as well as to study the behavior of magnetic fields in different scenarios.

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