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:

  1. $B C, C D$ and $B A$ are known resistances.

The unknown resistance is connected between $A$ and $D$.

Hence, the correct option is (c).



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