The equivalent resistance of the circuit across 
is given by
A
B
C
or 
D
or 0
Text Solution
Verified by ExpertsThe correct answer is:
C
If 
, then both the junction diodes are in forward biased and the given circuit diagram becomes a balanced Wheatstone bridge. The equivalent resistance in this case becomes 
.
If 
, then the diodes are reverse biased. In that case, 
and 
are in series, i.e. 
.
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