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Re: [femm] high schoool science project
In a message dated 4/8/00 1:42:37 AM Central Daylight Time,
jtheobald@xxxxxxxxxxxxxxxx writes:
<< Hello,
This is the first site that offered any information that I might
have the chance of understanding. I am very intrested in magnets but
don't know where to start. My physices teacher in high school showed
me a device that most similarly remindes me of a selinoid valve. the
device was built with a coil attached to a base with an extension
cord sodesrd to the 2 ends of the coil. A cylindrical ferrous core
was placed in the center. When pluged into an electrical source it
was able to suspend a metalic ring in the air. it also could launch
the ring into the air if placed around the core and then plugged in.
My questions are:
1. How can i calculate the upward force of the magnetic feild?
2. How can i calculate the power required to lift the metalic
ring a specific distance.
3. Lastly, if the total power in watts renmains constant for any
electromagnet, will a power source with a higher voltage and
very low amperage, or lower voltage and higher amperage
produce a greater magnetic feild?
>>
Can anyone give me a diagram for building what this person is talking about?
And also the amperage and voltage needed?
Any help would be appreciated!! Very interested in magnetics myself! Thanks.