Not how strong, but how close. Any electronic device will be
affected by the electromagnetic radiation produced naturally by
There is a magnetic field but there is no “radiation” from a magnet
(except, of course, from any embedded trace amounts of unstable
element atoms in the material–but that will be far less than what we
are bombarded with from space, or even the Earth, everyday.)
But yes, the magnetic field can cause problems because whenever it
is moved across a wire or other material containing electrons that
are free to move it will tend to cause them to move (that is how
electric generators work). In the standard pace maker there is the
control module with a long wire going to the action module at the
heart and it’s the wire that generally allows the problems and makes
the use of MRIs on pacemakered individuals risky. Whether the
magnetic clasp would have a strong enough magnetic field to cause
enough electrons to move in the wire and be acted on as a "firing"
signal to the action module at the heart is the real question. The
basic answer, I suspect, is the risk would be negligible. There was a
good article in Popular Science a month or so ago regarding the new
pacemakers which dispose of the wire and replace it with an optical
fiber.
James E. White
Inventor, Marketer, and Author of “Will It Sell?
How to Determine If Your Invention Is Profitably Marketable
(Before Wasting Money on a Patent)” www.willitsell.com