US Navys Electromagnetic Railgun

A railgun is a purely electrical gun that accelerates a conductive projectile along a pair of metal rails using the same principles as the homopolar motor.

Railguns use two sliding or rolling contacts that permit a large electric current to pass through the projectile. This current interacts with the strong magnetic fields generated by the rails and this accelerates the projectile.

The U.S. Navy has tested a railgun that accelerates a 7 pound projectile to seven times the speed of sound.

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