First slide

KVL

Question

For the post office box arran8ement to determine the value of unknown resistance, the unknown resistance should be connected between

Moderate

A

B and C
B

C and D
C

A and D
D

B₁ and C₁,

Solution

Post office box is based on the principle of Wheatstone's bridge. The circuit of Wheatstone's bridge is shown in fig. P and Q are ratio arms and BA is known resistance arm, The unknown resistance S is connected between AD arm.

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