Distance away to create the same magnetic field strength?

In summary, the question asks for the distance from a thin wire carrying a 38 A current at which the magnetic field strength is equal to a refrigerator magnet of 4.35 x 10^-3 T. Using the equation B=(μo/2pi)*(I/d) and substituting μo=4pi*10^-7, the calculated distance is 0.0017m. However, the given answer is not accepted as correct, even after trying a value that is very close.
  • #1
conov3
34
0
1. Homework Statement

At what distance (in m) from a very thin, straight wire carrying a 38 A current would the magnetic field strength be the same as a refrigerator magnet of 4.35 x 10-3 T?

2. Homework Equations

B=(μo/2pi)*(I/d)
where μo=4pi*10^-7

3. The Attempt at a Solution

4.35e-3(d)=2.0e-7*(38)
d=.0017m
It says this is wrong? so I must have done something wrong.. any help would be appreciated!
Thanks for your time!
 
Physics news on Phys.org
  • #2
that's what I got too, is this an online homework? Did you try 0.00169? Sometimes they can be annoying with sig figs.
 
  • #3
Yes, I just tried that.. and it didn't say it was correct. It usually will give me the answer if it is that close but it says that is the wrong answer.
 

Related to Distance away to create the same magnetic field strength?

What is magnetic field strength?

Magnetic field strength is a measure of the force exerted by a magnetic field on a unit electric charge, moving in a particular direction.

Why does distance affect magnetic field strength?

Distance affects magnetic field strength because the farther away an object is from a magnetic source, the weaker the magnetic field will be. This is because the magnetic field lines spread out and become less concentrated as distance increases.

How do you calculate the distance needed to create the same magnetic field strength?

The distance needed to create the same magnetic field strength can be calculated using the inverse-square law. This states that the magnetic field strength is inversely proportional to the square of the distance from the source. So, if you know the magnetic field strength at one distance, you can calculate the distance needed for a different magnetic field strength.

What are the units of magnetic field strength?

The units of magnetic field strength are Tesla (T) in the SI system and Gauss (G) in the CGS system.

How does the shape of the magnetic source affect distance and magnetic field strength?

The shape of the magnetic source can affect distance and magnetic field strength in various ways. For example, a bar magnet will have a stronger magnetic field at its poles compared to its sides. Additionally, the shape of the magnetic source can also affect the direction and pattern of the magnetic field lines, which can impact the strength of the magnetic field at different distances.

Similar threads

How to find an expected value for magnetic field strength?
    • Introductory Physics Homework Help
Replies
1
Views
906
(Magnetism) Magnetic pull force on a steel ball
    • Introductory Physics Homework Help
Replies
4
Views
435
Magnetic field pointing into a normal magnetized compass needle
    • Introductory Physics Homework Help
Replies
16
Views
452
Find distance with magnetic field and current?
    • Introductory Physics Homework Help
Replies
1
Views
5K
How far from this current-carrying wire will the Earth's magnetic field cancel the B-field from the wire?
    • Introductory Physics Homework Help
Replies
5
Views
1K
Strength of magnetic field at the end of a wire wrapped nail.
    • Introductory Physics Homework Help
Replies
1
Views
969
Understanding work in translation and rotation of a magnetic dipole
    • Introductory Physics Homework Help
Replies
1
Views
438
Comparing Magnetic Field Strengths with Vectors
    • Introductory Physics Homework Help
Replies
6
Views
1K
Finding the Earth's magnetic field strength using a Galvanometer
    • Introductory Physics Homework Help
Replies
13
Views
2K
Electromagnetic effects and Magnetic Fields Questions
    • Introductory Physics Homework Help
Replies
2
Views
1K

Hot Threads

Recent Insights

Back
Top