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How Coil Gun work

  1. Apr 12, 2014 #1
    What is the physics behind coil gun.

    For the magnetic field part, that is convert a electric voltage to the magnetic field. How the magnetic field related to the voltage?
    Is there any equation for the conversion the voltage to the magnetic field, maxwell or others?

    After that, the magnetic field will push to metal bullet, in this case is it the force is convert from magnetic force to the mechanical force? How to calculate the mechanical force from the magnetic field?

    Thanks alot
  2. jcsd
  3. Apr 12, 2014 #2


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    Science Advisor
    Gold Member

    Every current has an associated magnetic field - see Ampere's law.

    When you arrange the current carrying wire appropriately you can increase the magnetic field strength - see solenoids.

    When the current is pulsed correctly a metal object can be moved ... do it right and you have a magnetic coil gun: http://en.wikipedia.org/wiki/Coilgun

    For other techniques see magnetic rail guns: http://en.wikipedia.org/wiki/Railgun
  4. Apr 12, 2014 #3


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    Staff: Mentor

    It's not the voltage that determines the magnetic field, it's the current. The voltage and resistance set the current flow.
  5. Apr 13, 2014 #4

    For the rail gun, the magnetic field on rail do not play any role, Right?
  6. Apr 13, 2014 #5


    by the way do we can equal the magnetic force to mechanical force?
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