| Jumping Ring & Induction of Current | ||
| Description: | A demonstration of electromagnetic induction. |
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| Notes: | The AC powered coil has an iron core within. Plug into an AC outlet, put one of the aluminum rings on the iron core, stand back and press the red button on the cord box. The changing magnetic flux from the coil causes changing magnetic flux through the ring. The induced EMF of the ring induces a current that opposes the change in magnetic flux. Rings that have a split will not launch. Dip the solid ring in liquid nitrogen, and the effect is enhanced; the ring will fly much higher. There is a also a copper coil that has a bulb attached. Place this on the apparatus; pressing the red button will illuminate the bulb by induction. |
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| Location: | LDL-D6. A short AC cord and push button switch are permanently attached |
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| Image: |
 Ring launcher shown with three aluminum rings |
 Wire coil with bulb (improved design) |
 The wire coil and bulb are placed on the ring launcher |
 Press the red button, et voilá! |
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| © | St. Lawrence University | Department of Physics |
| Revised: 09 Nov 2018 | Canton, NY 13617 |