An insulating surface covers the magnet and {HEAD ~ a conductive liquid} is disposed in {TAIL ~ a channel} defined by the insulating surface and the lower case sidewalls 
is disposed in
An insulating surface covers the magnet and { HEAD ~ a conductive liquid } is disposed in { TAIL ~ a channel } defined by the insulating surface and the lower case sidewalls
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH