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  4. R1, R2, R3 different values of R, A, B, C are the null points obtained corresponding to R1, R2 and R3 respectively. For which resistor, the value of X will be the most accurate and why?

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Q. $R_1, R_2, R_3$ different values of R, A, B, C are the null points obtained corresponding to $R_1, R_2$ and $R_3$ respectively. For which resistor, the value of X will be the most accurate and why?Physics Question Image

IIT JEEIIT JEE 2005Current Electricity

Solution:

Slide wire bridge is most sensitive when the resistance of all the four arms of bridge is same.
Hence, B is the most accurate answer.