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# high schoool science project

- To: femm@egroups.com
- Subject: high schoool science project
- From: jtheobald@cannondesign.com
- Date: Sat, 08 Apr 2000 06:41:58 -0000
- User-agent: eGroups-EW/0.82

    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?

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