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An unknown resistance X is to be determi...

An unknown resistance X is to be determined using resistances `R_1, R_2 or R_3`. Their corresponding null points are A, B and C. Find which of the above will give the most accurate reading and why?
. `R= R_1 or R_2 or R_3`.

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The correct Answer is:
This is true for `r_(1)=r_(2)`; So `R_(2)` given most accurate value
This is true for `R=R_(2)`
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