Important classes of magnetometers include using a rotating coil, Hall effect magnetometers, fluxgate magnetometers.
2.
A braking mechanism or high ratio gearing is used to hold the rotating coil in place against the powerful magnetic forces acting on the moving coil.
3.
If you use 2 magnets, they should have the N pole of one facing the S pole of the other above and below the rotating coil.
4.
The new ident featured a rotating coil of metal, with David Lowe and was similar to the BBC News theme of the time and reflected the similarity between the channel and the BBC News service.
5.
The commutator allows each armature coil to be energized in turn and connects the rotating coils with the external power supply through brushes . ( Brushless DC motors have electronics that switch the DC current to each coil on and off and have no brushes .)
6.
Earlier electromagnetic machines passed a magnet near the poles of one or two electromagnets, or rotated coils wound on double-T armatures within a static magnetic field, creating brief spikes or pulses of DC resulting in a transient output of low average power, rather than a constant output of high average power.
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