Question

Why is high accuracy achievable in Wheatstone bridge measurements?

विकल्प

• 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

Answer 1

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.