Two junction diodes one of germanium (Ge) and other of silicon (Si) are connected as shown in fig to a battery of e.m.f. 12 V and a load resistance `10kOmega` The germanium diode conducts at 0.3V and silicon diode at 0.7 V When a current flows in the circuit , the potential of terminal Y will be :

Options

A. 12 V
B. 11 V
C. 11.3 V
D. 11.7 V

Answer

C

Explanation

Ge is at 0.3 V and Si at 0.7 V .
Both Ge and Si didoes are in parallel When current flows, P.D. remains at 0.3 V, so no current flows through Si - diode.
P.D. across `R_L=12-0.7 =11.3V`
`:.` Potential at `Y = 11.3V`