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+1 vote
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in Physics by (91.3k points)
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The equivalent resistance of the circuit, across AB is given by
image
A. `6.2 Omega`
B. `5.64 Omega`
C. `8.2 Omega`
D. `5.6 Omega or 8.2 Omega`

1 Answer

+1 vote
by (91.0k points)
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Best answer
Correct Answer - 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.
image
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
image
The effective resistance is
`=4+(9xx8)/(9+8)=8.24 Omega`

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