Two identical ideal diodes are connected to an ammeter and a d.c… | MHT CET 2021 (24 Sep, Shift 1)

Q71MHT CET 2021 · 24 SEP · SHIFT 1Medium

P-N Junction Diode

Two identical ideal diodes are connected to an ammeter and a d.c source (1 volt) as shown. In which one of the following circuits, ammeter will not show any deflection?

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Answer: (b)

In circuit (a) the two diodes face opposite ways in series (back to back).
Whatever the battery polarity, one of them is always reverse biased, so no current flows.
In (b) both are forward biased in series; in (c) and (d) at least one parallel diode is forward biased, so current flows.
So the answer is (b), i.e. circuit (a).

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