A simple \(\mathrm{p\text-n}\) junction diode follows the law:    \(i\text{(current)}=i_0e^{qV/kT},\) for large currents in forward bias.
Here, \(T=\) absolute temperature, \(V=\) voltage across the diode, \(k=\) Boltzmann's constant and \(i_0=\) the drift current.
Then, the differential resistance of the diode \(\left(\dfrac{dV}{di}\right)\) is given by:
1.  \(\text{(constant)}i\)
2.  \(\text{(constant)}i^2\)
3.  \(\dfrac{\text{constant}}{i}\)
4.  \(\text{(constant)}e^{-\beta i},~\beta\text{-constant}\)

Subtopic: PN junction |

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q12:

Which of the following represents a circuit that gives an output (i.e. true) when both its inputs are equal?

1.
2.
3.
4.

Subtopic: Logic gates |

57%

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q13:

The current-voltage characteristic of an ideal \(\mathrm{p \text{-}n}\) junction diode is given by the graph as shown in the following figure:

This diode is connected with a resistance of \(5~\Omega\) in series with it as shown below:

Which of the following shows the dependence of the voltage \(V_{AB}\) and the current \(i,\) when the diode is forward-biased?
(\(V_{AB}\) in volt, \(i\) in ampere)

1.	\(V_{A B}=i\cdot5+0.6\)
2.	\(V_{A B}=i\cdot5-0.6\)
3.	\(V_{A B}=i\cdot5+(0.6-5)\)
4.	\(V_{A B}=i\cdot5+\left(0.6+5\right)\)

Subtopic: PN junction |

From NCERT

1

2

3

4

To unlock all the explanations of this course, you need to be enrolled.

Hints

To unlock all the explanations of this course, you need to be enrolled.

Q14:

The voltage \(V_{AB}=20~\text{V}\) at its peak value, and is sinusoidal in time. The current \(i\) (in amperes), when plotted as a function of time, is given by:
(consider the diodes as ideal.)