# How Coil Gun work

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

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UltrafastPED
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

1 person
Drakkith
Staff Emeritus
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?
It's not the voltage that determines the magnetic field, it's the current. The voltage and resistance set the current flow.

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

For the rail gun, the magnetic field on rail do not play any role, Right?

It's not the voltage that determines the magnetic field, it's the current. The voltage and resistance set the current flow.

Thanks,

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