Re: induced emf again

["John S. Denker" <jsd@MONMOUTH.COM>]

Bob Sciamanda wrote [as corrected]:
> To answer directly:  yes, qVxB = qE holds only for zero current (or even
> with current if the rod has zero resistance).

I wouldn't have said that.  When E is equal to v × B, that
is the condition for zero net force on the electrons.  Any
steady straight-line current meets this condition, whether
the current is zero or not, and whether the resistance is
zero or not.

=================

Please, let's try to stick to the known physics (Maxwell
equations, Lorentz force law, et cetera).

There are one or two correct ways to analyze this problem.
We know what they are.

There are innumerably many incorrect ways to analyze this
problem.  It's not worth discussing each of them in detail.

As an analogy, consider the problem of getting a hot saucepan
off the stove.  It is recommended to grab it by the handle.
There are lots and lots of other places you _could_ grab it,
but you'll get burned.  After you've been burned enough times,
you'll learn to grab it by the handle.  (There are other, more
complicated approaches that might work, but simply grabbing it
at some random place is really not worth trying.)

Don't sit on the cactus.  There are better places to sit.

Don't sleep in the middle of the highway.  There are better
places to sleep.