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) B1 and C1

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Solution:

  1. BC,CD and BA are known resistances.

The unknown resistance is connected between A and D.

Hence, the correct option is (c).



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