# The value of G was first established by-

4 views
in Physics
closed
The value of G was first established by-
1. Isaac Newton
2. Pascal
3. Cavendish
4. Galileo

by (54.3k points)
selected

Correct Answer - Option 3 : Cavendish

The correct answer is option 3) i.e. Cavendish

CONCEPT:

• Law of Universal Gravitation: It states that all objects attract each other with a force that is proportional to the masses of two objects and inversely proportional to the square of the distance that separates their centres.

It is given mathematically as follows:

$F = \frac{Gm_1m_2}{R^2}$

Where m1 and m2 are the mass of two objects, G is the gravitational constant and R is the distance between their centres.

• The gravitational constant G establishes a relationship between gravitational force, mass, and distance.
• The value of G is 6.67 × 10-11 N kg-2 m2.

EXPLANATION:

• The value of G is obtained from Cavendish's experiment.
• The Cavendish experiment is based on torsion balance to measure the weak gravitational force between lead balls.
• The torsion balance consists of a bar suspended at its middle by a thin wire.
• The twist of the wire is measured which is then incorporated in the force-torsion equation of the system to find the value of G.
• So, the value of G was first established by Cavendish and it is universally accepted.