Ring Launcher
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Product Code : SCL-PLE-11589
Quick Answer: The Ring Launcher, also known as Elihu Thomson’s apparatus, is an AC solenoid with a removable laminated soft iron core that throws a solid aluminium ring upwards by induced eddy currents; a split aluminium ring and a plastic ring are included for comparison.
Last updated: 18 October 2026
Key Features
- Thick copper wire solenoid on a stable base.
- Removable laminated soft iron core concentrates the magnetic flux.
- Three rings: solid aluminium, split aluminium and plastic.
- Insulated terminal housing.
- Shows electromagnetic induction and Lenz's law repulsion.
Technical Specifications
| Specification | Value |
|---|---|
| Coil | Thick copper wire solenoid |
| Core | Removable laminated soft iron |
| Rings | 3: 1 solid aluminium, 1 split aluminium, 1 plastic |
| Supply type | Alternating current (AC) |
| Base | Stable base with insulated terminal housing |
How It Is Used
With a ring placed over the core and AC applied to the coil, the changing field induces eddy currents in the solid aluminium ring, which is repelled and jumps up the core. The split ring cannot carry a circulating current and the plastic ring does not conduct, so neither is launched, showing that the effect depends on induced current.
Frequently Asked Questions
Why does the Ring Launcher come with three rings?
For comparison. The solid aluminium ring is thrown upwards by induced eddy currents, while the split aluminium ring and the plastic ring show what happens when there is no closed conducting path.
Related Physics Lab Equipment
See the full physics lab equipment range, or these related electromagnetic induction apparatus:
- Lenz's Law Apparatus
- Eddy Current Apparatus
- Eddy Current Model (Disc Type)
- Solenoid Model
- Faraday’s Law Apparatus
For a quotation on the Ring Launcher, contact JLab India on +91-8569909696.
