Christian McArdle wrote in message 400d61d4$0$13350Indeed. Once you get
past the A-Level stage, they are all just flavours of
applied mathematics. Three dimensional differential equations in conical
coordinates, anyone?

Don't you just hate it when people take the easy option, instead of doing
the job properly with partials and integrating round the loop, so that they
may perhaps, understand it?

Regards
Capitol