Question

Assuming the diodes to be of silicon with forward resistance zero, the current I in the following circuit is 

• A. 0
• B. 9.65 mA
• C. 10 mA
• D. 10.35 mA

Hint:

In silicon diodes, always account for a 0.7 V forward drop.

Answer 1

The Correct Option is B

Step 1: Silicon diode forward drop ≈ 0.7 V.
Step 2: Effective voltage across resistor, VR=20-0.7=19.3 V
Step 3: Current, I=(19.3)/(2000)=9.65 mA