Which circuit will not show current in ammeter ?

Options

A. Figure 1
B. Figure 2
C. Figure 3
D. Figure 4

Answer

A

Explanation

Current wilI flow in (2), (3) and (4) because in (2), the diodes are in series and are forward biased. In (3), they are m parallel but one is forward biased and the other is reversed biased. Hence no current will flow in that diode but the current flows through the other diode. In ( 4) both of them are in parallel and forward biased. But in Fig. (1) they are in series but first diode is reverse biased. Hence no current will flow.