Re: is the magnetic field really moving?

----------------------------
"Salmon Egg" <SalmonEgg@[EMAIL PROTECTED]
> wrote in message 
news:SalmonEgg-D9F14F.16234731072008@[EMAIL PROTECTED]
> In article <Ydqkk.150504$gc5.99977@[EMAIL PROTECTED]
>,
> "Don Kelly" <dhky@[EMAIL PROTECTED]
> wrote:
>
>> > Dip a bar magnet into iron filings to map the lines of force. Rotate 
>> > the
>> > magnet and you can see the "lines" rotating with the magnet. This
>> > experiment must have been performed countless times.
>> >
>> > On the other hand, perform an experiment with a rotating nozzle on
the
>> > end of a hose. Does the column of water leaving the nozzle rotate
with
>> > the nozzle?
>> >
>> > Bill
>> -------------
>> But as the filings form lines of little magnets which are "attached" to

>> each
>> other and to the magnet- and are stable in position with respect to the
>> magnet- likely as determined by minor variations in the surface - why 
>> should
>> they not move with the magnet. Now a thin film of lubricant on the
magnet
>> might show something different :)
>>
>> -- 
>>
>> Don Kelly dhky@[EMAIL PROTECTED]
>> remove the X to answer
>
> I just thought of another experiment or two. Make a solenoid wound on
> cardboard tube many (10) times longer than its diameter. Tuck a battery
> inside the tube to drive the solenoid. Cap the tube ends with
> nonmagnetic thrust bearings. Sprinkle the iron filings on the caps to
> map the lines of force.
>
> Rotate the caps while keeping the tube stationary. The "lines" rotate.
> Now keep the caps from rotating and rotate the main solenoid. Now, the
> "lines" do not rotate with the solenoid.
>
> Draw your own conclusions.
>
> Bill
--------------
That's good, I like that. ;)
-- 

Don Kelly dhky@[EMAIL PROTECTED]
 the X to answer