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(B) In circuit $(a)$,the two diodes are connected in series such that they oppose each other. Specifically,one diode is forward-biased while the other

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$(b)$

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(B) In circuit $(a)$,the two diodes are connected in series such that they oppose each other. Specifically,one diode is forward-biased while the other is reverse-biased. Since an ideal reverse-biased diode acts as an open circuit (infinite resistance),no current flows through the circuit. Therefore,the ammeter will not show any deflection.In circuit $(b)$,both diodes are forward-biased,allowing current to flow.In circuits $(c)$ and $(d)$,the diodes are in parallel,and at least one path is forward-biased,allowing current to flow.

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

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