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The equivalent resistance of the circuit...

The equivalent resistance of the circuit, across AB is given by

A

`6.2 Omega`

B

`5.64 Omega`

C

`8.2 Omega`

D

`5.6 Omega or 8.2 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D
When positive of external battery is connected to A and negative of battery to B then `D_1` is forward biased, will offer least resistance. `D_2` is reverse biased will offer maximum resistance. The effective circuit will be as shown in figure.

The effective resistance is
`=(2xx9)/(2+9)+4=5.64 Omega`
When negative of external battery is connected to A an positive of battery to B, then `D_1` is reverse biased and `D_2` is forward biased. The effective circuit will be as shown in figure

The effective resistance is
`=4+(9xx8)/(9+8)=8.24 Omega`
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