Physics - Semiconductors Question with Solution | TestHub

If${\mathrm{V}}_{\mathrm{A}}>{\mathrm{V}}_{\mathrm{B}}$, both the junction diodes are forward biased and the given circuit diagram becomes a balanced Wheatstone bridge. The equivalent resistance, in this case, becomes$4 \mathrm{\Omega }$.

If${\mathrm{V}}_{\mathrm{B}}>{\mathrm{V}}_{\mathrm{A}}$, the diodes are reverse biased. In that case,$4 \mathrm{\Omega }$,$5 \mathrm{\Omega }$and$4 \mathrm{\Omega }$are in series.