The K and J Magnetics Calculator is a powerful tool used to determine the magnetic field strength produced by a magnet at a certain distance. It utilizes a formula based on fundamental principles of magnetism to calculate the strength of the magnetic field in teslas (T) given the magnetization of the magnet in ampere-meters (A-m) and the distance from the center of the magnet to the point of interest in meters (m).
Formula of K and J Magnetics Calculator
The formula used by the K and J Magnetics Calculator is as follows:

Where:
- B is the magnetic field strength in teslas (T).
- r is the distance from the center of the magnet to the point of interest in meters (m).
- M is the magnetization of the magnet in ampere-meters (A-m).
- μ₀ is the permeability of free space, approximately 4π × 10^−7 T*m/A.
This formula provides a precise calculation of the magnetic field strength, allowing users to understand and predict the behavior of magnets in various applications.
General Terms Table
Distance (r) (m) | Magnetic Field Strength (B) (T) |
---|---|
0.01 | 0.000127 T |
0.02 | 0.000016 T |
0.03 | 0.000004 T |
0.04 | 0.000002 T |
0.05 | 0.000001 T |
0.06 | 0.000001 T |
0.07 | 0.000000 T |
0.08 | 0.000000 T |
0.09 | 0.000000 T |
0.10 | 0.000000 T |
Example of K and J Magnetics Calculator
Let’s consider an example to demonstrate how the K and J Magnetics Calculator works:
Suppose we have a magnet with a magnetization (M) of 100 A-m and we want to calculate the magnetic field strength (B) at a distance (r) of 0.05 meters from the center of the magnet.
Using the formula:
B = (4π × 10^−7 * 100) / (2 * π * 0.05³)
B ≈ (4π × 10^−5) / 0.00025 ≈ 0.000025 T
So, the magnetic field strength at a distance of 0.05 meters from the magnet is approximately 0.000025 teslas.
Most Common FAQs
A: Magnetization is the measure of the extent to which a material is magnetized, indicating the strength of its magnetic properties.
A: The magnetic field strength decreases with increasing distance from the magnet, following the inverse cube law.
A: Permeability is the measure of a material’s ability to support the formation of a magnetic field within itself. Higher permeability materials are easier to magnetize.