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