Spinning magnetic field through a coil-can this propel engines?? Magnetic field through a coil produces torque in the coil. Suppose we have a coil.The set up is such that the magnetic field passes through the coil.Now,if we spin the magnetic field along with the coil,the coil will keep spinning.an axle can be connected to the coil.and a much heavier object,say a ship propeller can be attached to the axle.as the field spins[this can be done by keeping a very powerful horseshoe magnet over the coil and spinning the magnet],the coil will spin,and the axle along with the propeller will spin. Is this possible??