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In page Magnetoplasmadynamic thruster:

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Generally, a gaseous material is ionized and fed into an acceleration chamber, where the magnetic and electric fields are created using a power source. The particles are then propelled by the Lorentz force resulting from the interaction between the current flowing through the plasma and the magnetic field (which is either externally applied or induced by the current) out through the exhaust chamber. Unlike chemical propulsion, there is no combustion of fuel.[citation needed] As with other electric propulsion variations, both specific impulse and thrust increase with power input, while thrust per watt drops.