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Q.

The equivalent resistance between A and B is

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a

20 ohm if VA>VB

b

30 ohm ifVA>VB

c

zero if VA>VB and  50 ohm if VA 

d

zero if VA>VBand 50 ohm if VA

answer is D.

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Detailed Solution

If VA>VB all the diodes are in the forward bias so resistance of the circuit is zero.but if VA
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