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Question

For the circuit shown in the figure. The equivalent resistance between point A and B for the two cases (i)VA>VB (ii) VB>VArespectively is _______ Ω and ________ Ω respectively (D1 and D2 are ideal diodes)
851524_18296aeca525457e965fc95286ddb363.png

A
25,
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B
50,
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C
,25
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D
50,50
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Solution

The correct option is B 25,
For VA>VB
Both diodes are forward biased
so equivalent resistance will be the parallel connection of the resistances.
Req=R1R2R1+R2

Substitute the values:
R1=50×5050+50=25Ω


If VA<VB

Both of the diodes are reverse biased and they will not let the circuit to be closed.
Therefore, the equivalent resistance of the equivalent circuit will be infinity

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