Q.

The reading of ammeter in the following circuit. (Assuming forward voltage drop across diode is zero)

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a

0.5 mA

b

1.0 mA

c

1.5 mA

d

2.5 mA

answer is A.

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Detailed Solution

1st Zener diode is forward biased hence it will behave as normal diode.2nd Zener diode is reverse biased. Voltage drop across resistor , V=20-15=5VTherefore, Current in circuit, I=VR=510000=0.5×10-3A=0.5mA
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