Question

Gravitational constant is experimentally measured using a

• A. physical balance
• B. torsional balance
• C. beam balance
• D. gyrometer

Answer 1

Answer: (B)

torsional balance

Gravitational constant is experimentally determined by the Cavendish experiment. It uses a torsional balance, 2 big spheres, 2 small spheres and a rod. The faint attraction between balls placed alongside the beam is detectable by the deflection it causes. It uses the concept of Force-Torque equilibrium.