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b value The Cavendish apparatus is examined and the masses of the large lead spheres found to be 1.5 kg, and their diameter 5.82 cm. The width of the perspex casing housing the torsion pendulum is measured to be 3.06 cm. The small lead spheres have mass 15 g and the spacing between them on the fixed rod is 10.0 cm. The distance from the mirror to the ruler on the wall was measured to be 3.51 m. Determine the value of b, the centre to centre spacing between the large and small lead spheres. Give the answer in SI units to 3 significant figures. Note that this distance is assumed to be constant throughout the experiment, that the gravitational force is constant between the balls and not affected by the small motion of the torsion pendulum. Answer:b value The Cavendish apparatus is examined and the masses of the large lead spheres found to be 1.5 kg, and their diameter 5.82 cm. The width of the perspex casing housing the torsion pendulum is measured to be 3.06 cm. The small lead spheres have mass 15 g and the spacing between them on the fixed rod is 10.0 cm. The distance from the mirror to the ruler on the wall was measured to be 3.51 m. Determine the value of b, the centre to centre spacing between the large and small lead spheres. Give the answer in SI units to 3 significant figures. Note that this distance is assumed to be constant throughout the experiment, that the gravitational force is constant between the balls and not affected by the small motion of the torsion pendulum