Question

Four ideal diodes are connected as shown in circuit.
The current through 20 $\Omega$ resistor will be

• A. $0.2A$
• B. $0.3A$
• C. $0.5A$
• D. Zero

Answer 1

The correct option is C $0.5A$


The diodes $1$ and $4$ are forward biased (free flow of current), $2$ and $3$ are reverse biased (no flow of current). The current flows as shown. So, effective resistance $=20\Omega$
$\therefore i_o=\frac{V}{R}=\frac{10}{20}=0.5A$.