Q.

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

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a

B and C

b

C and D

c

A and D

d

B1 and C1,

answer is C.

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Detailed 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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