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Questions  

The equivalent resistance between A and B in ohm  is VA>VB

 

a
3
b
9
c
4.5
d
18

detailed solution

Correct option is C

Here the diode is in reversed bias as VA>VB potential drop across the 3 ohm resistance is less than potential drop across 6 ohm resistance. So resistance of each branch is 9 ohm and equivalent resistance is 9||9 = 4.5 ohm

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