Determination of the Gravitational Constant Manufacturer,Supplier and Exporter in India
Product Code : EL-TWL-11799
Quick Answer: The Determination of the Gravitational Constant apparatus is a torsion pendulum with two small lead spheres on a light bar, suspended from a 25 micrometre tungsten wire and attracted by two 1 kg lead spheres. It allows the gravitational constant to be found within a single lesson to better than 10%.
Last updated: October 2026
Key Features
Torsion pendulum: light bar with two 15 g lead spheres on a thin tungsten wire.
Two large lead spheres of 1 kg each.
Capacitive differential sensor measuring rotation, largely suppressing noise and vibration in the signal.
Angular resolution of 25 microradians.
Output recorded on a computer, with data transferable to a spreadsheet; light pointer as an alternative display.
Sampling rates of 0.5, 1, 2, 5 or 10 samples/s.
Technical Specifications
| Specification | Value |
|---|---|
| Torsion wire | Tungsten, 25 micrometres |
| Large spheres | Lead, 1 kg |
| Small spheres | Lead, 15 g |
| Angular resolution | 25 microradians |
| Period of oscillation | 2–4 min |
| Sampling rate | 0.5, 1, 2, 5, 10 samples/s |
| Weight | 5 kg |
| Dimensions | 190 x 180 x 200 mm |
About This Product
When the large spheres are swung to a new position, their pull on the small spheres moves the pendulum from rest and it oscillates about a new rest position. The sensor tracks this motion, which has a period of 2 to 4 minutes, and the computer record gives the data needed to calculate the gravitational constant. The experiment demonstrates directly the force of gravity between two masses.
Frequently Asked Questions
How long does a measurement take?
The gravitational constant can be determined within a single lesson, with an accuracy better than 10%. The pendulum's period of oscillation is 2 to 4 minutes.
How is the motion recorded?
A capacitive differential sensor measures the rotation and the output is recorded on a computer at 0.5 to 10 samples/s. Data can be moved to a spreadsheet for evaluation, or the motion shown with a light pointer.
Related: Training Workshop Labs, Apparatus for the Study of Harmonic Oscillations, Atwood Machine, Data Acquisition / Switch System.
For a quotation on the Determination of the Gravitational Constant, contact Educational Lab Equipments.
