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Re: [Phys-l] collapsing field in inductor



Yes, quite, but not what I wanted. The magnet is far from the lamp, the switch is not.

Reminds me of a single loop fill. lamp (120 V. AC) w/ a small magnet glued to bulb. The filament oscillates. [Probably oscillates in UHF region also!]

bc

Brian Whatcott wrote:

At 11:36 AM 2/15/2007, you wrote:

I wish your opinions (analyses) on this simple demonstration posted on
another list.

A lamp and inductor in parallel are powered by a DC supply (battery)
thru a switch. Opening the switch causes the lamp to flash. (nothing
surprising here). However, if the switch is operated in a strong mag.
field, e.g. large magnetron magnet, the flash is brighter and burns out
some bulbs, e.g. 25 W (110 V. I presume)

The poster referred to this page:

http://electro.physics.auburn.edu/~demo/em/5j/5j20_20.htm
<http://electro.physics.auburn.edu/%7Edemo/em/5j/5j20_20.htm>

bc


A low power high volt filament is delicate. In a strong magnetic
field, the filament may break if it is pulsed.



Brian Whatcott Altus OK Eureka!

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