Shown in figure is a Post Office box. In order to calculate the value of external resistance, it should be connected between [2004]

Question

Smart Achievers · Accepted Answer

(2)

Post office box is also works on the principle of a balanced Wheatstone bridge and is used to measure unknown resistance. The total external resistance will be the total resistance of the whole length of the box. It should be connected between A and D.

Solution

Q.
Shown in figure is a Post Office box. In order to calculate the value of external resistance, it should be connected between [2004]

1 B′ and C′

2 A and D

3 C and D

4 B and D

Ans.
(2)

Post office box is also works on the principle of a balanced Wheatstone bridge and is used to measure unknown resistance. The total external resistance will be the total resistance of the whole length of the box. It should be connected between A and D.

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