Question

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

• A. B' and C'
• B. A and D
• C. C and D
• D. B and D

Answer 1

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