Quick answer: the Electromagnet for Sonometer is an electrically driven accessory that produces a changing magnetic force near a stretched ferromagnetic sonometer wire, used to study forced vibration, resonance and stationary waves without direct mechanical contact.
Description
When connected to a suitable AC supply and positioned close to the sonometer wire, the electromagnet’s alternating magnetic force can drive the wire into transverse vibration. This lets students observe and measure resonance conditions and stationary wave patterns as the driving frequency is varied, without needing to pluck or otherwise mechanically disturb the wire.
It is used in physics experiments on forced vibration, resonance, stationary waves, and in some setups, for determining the frequency of an AC supply using a calibrated sonometer wire.
Specifications
| Type | Sonometer electromagnet accessory |
| Principle demonstrated | Forced vibration, resonance and stationary waves |
| Typical use | Sonometer resonance and AC-frequency experiments |
| Operating voltage and coil rating | Not specified for this listing — confirm with our sales team |
Care & Maintenance / Safety Note
- Connect the electromagnet only to the voltage and supply type confirmed as suitable, and run experiments under teacher supervision.
- Switch off the supply between observations to prevent the coil from overheating.
- Keep the electromagnet and its wiring away from moisture, and inspect leads for damage before each use.
- Store the electromagnet in a dry place, positioned so its core and mounting are not knocked or bent.
Why Choose LabEquip
LabEquip supplies electromagnetism and sound apparatus alongside a wider catalogue of physics lab equipment for schools and colleges. If you are equipping a sonometer setup, our U-Core Magnetic Field Apparatus and Horseshoe Magnet support related electromagnetism topics, and our full range of lab equipment covers the rest of the physics syllabus.
FAQ
Q: How does this electromagnet make the sonometer wire vibrate?
A: When connected to an AC supply, the electromagnet produces a changing magnetic force near the stretched sonometer wire, driving it into transverse vibration without any direct mechanical contact.
Q: What experiments is it used for?
A: It is commonly used to study forced vibration, resonance and stationary waves, and in some setups, to determine the frequency of an AC supply using a calibrated sonometer wire.
Q: What voltage and current does the electromagnet need?
A: The exact operating voltage and current rating are not specified for this listing. Please contact our sales team to confirm before you order.
Q: Does the wire need to be a specific material?
A: Yes, the sonometer wire needs to be ferromagnetic (such as an iron or steel wire) for the electromagnet to exert a noticeable force on it.
Q: What safety steps should I follow when using it?
A: Connect it only to the confirmed suitable supply, run the experiment under teacher supervision, switch it off between readings, and check the wiring for damage before each use.
Q: How should I store this electromagnet between uses?
A: Keep it in a dry place, positioned so its core and mounting are protected from knocks, and coil the leads neatly to avoid damage.
Last Updated: September 2026
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