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Question
Why is a small mirror fastened to the metallic fiber in the Cavendish balance?
Options
To reflect light back to the observer
To measure the angle of twist of the suspension wire
To reduce friction in the system
To protect the small spheres
MCQ
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Solution
To measure the angle of twist of the suspension wire
Explanation:
The mirror, combined with a light beam and scale arrangement, measures the angle of twist (θ) of the suspension wire, which is essential for calculating G.
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