Q.
For the post office box arrangement to determine the value of unknown resistance, the unknown resistance should be connected between
A) B and C
B) C and D
C) A and D
D) $B_{1}$and $C_{1}$
Explanation
(c) BC, CD and BA are known resistance.
The unknown resistance is connected between A and D.
Hence, the correct option is (c).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.