![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Magnetic_tension_diagram.svg/640px-Magnetic_tension_diagram.svg.png&w=640&q=50)
Magnetic tension
Restoring force on bent magnetic field lines / From Wikipedia, the free encyclopedia
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In physics, magnetic tension is a restoring force with units of force density that acts to straighten bent magnetic field lines. In SI units, the force density exerted perpendicular to a magnetic field
can be expressed as
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/37/Magnetic_tension_diagram.svg/640px-Magnetic_tension_diagram.svg.png)
where is the vacuum permeability.
Magnetic tension forces also rely on vector current densities and their interaction with the magnetic field. Plotting magnetic tension along adjacent field lines can give a picture as to their divergence and convergence with respect to each other as well as current densities.[citation needed]
Magnetic tension is analogous to the restoring force of rubber bands.[1]