# Ampere's Law Homework

• This Is Me
In summary, the conversation is about a student who missed a lesson on applying a question to a formula. The PF member suggests that the student show some effort in researching the problem and provides some suggestions such as checking Hyperphysics and the lesson notes. The student then mentions that they have received help, but the PF member is unsure of the quality of that help. The problem at hand is finding the magnitude of a magnetic field from a 3.5 cm conductor with a current of 1.8 A, and the PF member explains that Ampere's law is not applicable and the Biot-Savart law must be used, with the location of the point being crucial.

#### This Is Me

Homework Statement
What is the magnitude of a magnetic field from a 3.5 cm straight conductor with a current of 1.8 A?
Relevant Equations
∫B.dl = μ0I
(I accidentally missed my lesson and I don't know how to apply this question to the formula)

Welcome to PF.

Even if you missed the lesson, you need to show some effort before we can offer tutorial help. What have you found in your searching so far? Have you looked this up on Hyperphysics? Have you read over the lesson notes? Which textbook are you using?

berkeman said:
Welcome to PF.

Even if you missed the lesson, you need to show some effort before we can offer tutorial help. What have you found in your searching so far? Have you looked this up on Hyperphysics? Have you read over the lesson notes? Which textbook are you using?
I got some help, thanks though.

• berkeman
This Is Me said:
I got some help, thanks though.
I cannot imagine what kind of help you got. The statement of the problem is
This Is Me said:
Homework Statement:: What is the magnitude of a magnetic field from a 3.5 cm straight conductor with a current of 1.8 A?
To me, it says that you have a conductor, most likely a wire, that is 3.5 cm long which carries a current of 1.8 A. In that case, Ampere's law is not applicable and you have to (a) use the law of Biot-Savart and (b) know where in space the magnitude of the field is to be calculated. Another interpretation could be that the conductor is a very long wire (not explicitly mentioned in the statement) and the point of interest is at a distance of 3.5 cm from it (also not explicitly stated).

• Keith_McClary