Torsion balance is used to measure

Explanation

A torsion balance is a sensitive instrument used to measure weak forces. It consists of a horizontal rod suspended by a thin wire or fiber. The rod is balanced so that it is free to rotate. When a force is applied to the rod, it twists the wire, and the angle of twist is proportional to the force.Spring Constant: The torsion balance can be used to determine the spring constant of the wire or fiber by measuring the angle of twist for a known force.Electric Force: The torsion balance can be used to measure the electric force between charged objects. This was famously used by Coulomb to establish the inverse square law for electrostatic forces.Magnetic Force: The torsion balance can be used to measure the magnetic force between magnets or between a magnet and a current-carrying wire.Gravitational Constant: The torsion balance was used by Cavendish to determine the value of the gravitational constant (G), a fundamental constant in physics.