Current Electricity 4 Question 20
20. For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected between
(2004, 2M)
(a) $B$ and $C$
(b) $C$ and $D$
(c) $A$ and $D$
(d) $B _1$ and $C _1$
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Solution:
- $B C, C D$ and $B A$ are known resistances.
The unknown resistance is connected between $A$ and $D$.
Hence, the correct option is (c).
