Now that is downright elegant.
It should be pushed as a valuable method.
I agree. Were it not so elegant I certainly would not have
remembered it all these years after my brief exposure.
As I said, I've heard nothing of it since. I do use it in
my teaching, however, but I can't use it until the Faraday
effect is introduced, and that comes too late to use in
introductory courses when Ampere's law is first stated. I
have an informal physics meeting each week with some
students and I have told them about it.