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Question
Why is high accuracy achievable in Wheatstone bridge measurements?
Options
Because the null deflection condition eliminates the need for precise galvanometer calibration and relies on the precise ratio relationship of resistances
Because the four resistances are always equal in value
Because the galvanometer measures very large currents with great precision
Because the battery voltage is extremely stable and constant
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Solution
High accuracy in Wheatstone bridge measurements is achieved because the null deflection condition is independent of galvanometer calibration errors. The measurement depends only on the precise ratio relationship between the known and unknown resistances, which can be made very accurate by using high-quality resistors. The galvanometer only needs to detect the null point, not measure absolute values.
