What is the magnetic field around a long, current-carrying wire?

AI Thread Summary
The magnetic field around a long, current-carrying wire can be determined using the Law of Biot-Savart, which states that the field at a distance r from the wire is given by the formula (μI/2πr). Inside the wire, the magnetic field varies depending on the current distribution, while outside the wire, it follows the aforementioned formula. To solve for the magnetic field, applying Gauss's law for magnetism is essential. The discussion highlights the need for a straightforward approach without complex equations. Understanding these principles is crucial for accurately calculating the magnetic field in different regions around the wire.
Master J
Messages
219
Reaction score
0
A long, current carrying wire has a radius R and current I.
What is the magnetic field inside, and outside the wire?


Now, if it asked what is the field a distance r from the wire, I could simply use the Law of Biot & Savart (mu.I/2.pi.r). I havn't dome electricity in a while and I am stuck on this one.

I am sure its simple, I just need a nudge.

Thanks guys.
 
Physics news on Phys.org
I'm currently using my PDA so no complex equations.But you'll need to use the Gaussian surface for magnetic field.
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Similar threads

Calculating Magnetic Field at Point P for Perpendicular Current-Carrying Wires
Replies
2
Views
1K
Why is magnetic field B along a straight wire circular not radial?
Replies
14
Views
3K
Magnetic field pointing into a normal magnetized compass needle
Replies
16
Views
1K
Electromagnetism question -- Forces between two current carrying wires
Replies
7
Views
3K
The distance where the magnetic field of two wires is zero
Replies
2
Views
4K
What is the net force on the current loop?
Replies
8
Views
2K
Magnets near a current carrying wire
Replies
12
Views
2K
Magnetic field at origin due to infinite wires and semicircular turn
Replies
3
Views
2K
Magnetic field generated by an infinitely long current-carrying wire
Replies
43
Views
4K
Magnetic force on a wire due to a loop
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top