In the circuit shown if current for the diode is 20 μ A, the potential difference across the diode is

Question

In the circuit shown if current for the diode is 20 μ A, the potential difference across the diode is <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/59d6a79c62c0dcf8ee58152cd130ebd9-.png" /> (A) 2 V (B) 4.5 V (C) 4 V (D) 2.5 V

Tardigrade Admin · Accepted Answer

Since the diode is reversed biased, only drift current exists in circuit which is

20 μ A

.
Potential drop across

15 Ω

resistor,

= 15 Ω \times 20 μ A

= 300 μ V = 0.0003 V

Potential difference across the diode

= 4 - 0.0003 = 3.99 = 4 V

Q. In the circuit shown if current for the diode is $20 μ A$ , the potential difference across the diode is

$2 V$

$4.5 V$

$4 V$

$2.5 V$

Since the diode is reversed biased, only drift current exists in circuit which is $20 μ A$ .
Potential drop across $15 Ω$ resistor, $= 15 Ω \times 20 μ A$
$= 300 μ V = 0.0003 V$
Potential difference across the diode
$= 4 - 0.0003 = 3.99 = 4 V$

Q. In the circuit shown if current for the diode is 20μA, the potential difference across the diode is

2V

4.5V

4V

2.5V