# Mutual inductance

## Homework Statement Φ = M*I
Biot-Savart law
Ampere's law

## The Attempt at a Solution

I have the formula Φ = M*I, which means that to find the mutual inductance I simply need to find the magnetic flux through the top circuit due to the current in the bottom circuit. However, I don't yet have a solid grasp of Ampere's law. Is there a way to use Ampere's law in this situation, or am I going to have to grind it out with Biot-Savart?

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LowlyPion
Homework Helper
I have the formula Φ = M*I, which means that to find the mutual inductance I simply need to find the magnetic flux through the top circuit due to the current in the bottom circuit. However, I don't yet have a solid grasp of Ampere's law. Is there a way to use Ampere's law in this situation, or am I going to have to grind it out with Biot-Savart?
Looks like you will have a double integral for each point along the second wire for all the contribution from points on the first, then integrated over its own length.

http://en.wikipedia.org/wiki/Inductance#Mutual_inductance

Can I use Biot-Savart to find the magnetic field at some general point (x,y) in the plane, then integrate that over the area of the top loop to get flux?

Redbelly98
Staff Emeritus