The discussion revolves around the application of Ampere's Law to calculate magnetic fields, specifically in the context of a straight conductor carrying a current. The original poster expresses confusion regarding the application of the relevant formula due to missing a lesson.
The discussion is ongoing, with participants seeking to clarify the problem statement and the assumptions involved. Some guidance has been offered regarding the need to consider the nature of the conductor and the conditions under which Ampere's Law may or may not apply.
The original poster has not provided complete information about the problem setup, leading to questions about the length of the conductor and the specific point in space for which the magnetic field is to be calculated.
I got some help, thanks though.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 cannot imagine what kind of help you got. The statement of the problem isThis Is Me said:I got some help, thanks though.
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).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?