Question

Assuming diode to be ideal, the value of current I is ______mA


The value of current I is _______ mA.

• A. 1

Answer 1

The correct option is A 1
Assume that both diodes are conducting,
It follows that, $V_B=0$ and V = 0
The current $I_{D2}=0$ now determined from

$I_{D2}=\frac{10-0}{10}=1mA$
Writing a node equation at B is
$I+1=\frac{0-(-10)}{5}=2$
I = 1 mA
Thus, $D_1$ is conducting as originally assumed.