Question

In the circuit shown if drift current for the diode is 20 $\mu A,$ the potential difference a cross the diode is

• A. 2V
• B. $4.5V$
• C. 4 V
• D. $2.5V$

Answer 1

Answer: (C)

4 V

Answer 2

: since the diode is reversed biased, only drift current exists in circuit which is $20\mu A$

Potential drop across $15\Omega$resistor

}{= 300\mu V = 0.0003V}$$ Potential difference across the diode $$= 4 - 0.0003 = 3.99 = 4V$$