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Equivalent Resistance in Series Circuit

Shown in figu...

Question

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

B' and C'

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A and D

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C and D

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B and D

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Solution

The correct option is B A and D
solution:
in the given figure x is the unknown resistance which is connected between can and A ' here and which is equivalent to A and D according to question
hence the correct option: B

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