Q. If the ratio of current to current as depicted in the following diode circuits is then find value of .
(Assume both the diodes to be ideal)
Question

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Answer: 1

Solution:

In figure (a), diode D is forward biased.
Hence, the current will flow directly through the diode and equivalent circuit would be,
Solution
--------(i)
In figure (b), diode D is reverse biased. Hence, the current will flow through the branch containing resistor.
Solution

-----------(ii)
From (i) and (ii),