Indicate which of the following $p$-$n$ diodes are forward biased and which are reverse biased:

 

The figure shows two junction diodes $D_1$ and $D_2$ along with a resistance $R$ and a DC battery $E$. Show the path of the flow of appreciable current in the circuit.

The resistance of a $p$-$n$ junction is said to be low when forward-biased and high when reverse-biased. Explain.

What is an ideal junction diode? A square wave ($-5 \mathrm{V}$ to $+5 \mathrm{V}$) is applied to a $p$-$n$ junction diode, as shown.

Draw the output waveform across the resistor $R$. Assume that the diode is ideal.

Draw the output wave-form across $R$, for the input wave-form given.

A square wave ($-1 \mathrm{V}$ to $+1 \mathrm{V}$) is applied to a $p$-$n$ junction diode, as shown. Draw the output wave-form across the diode which is assumed to be ideal.

A diode is connected to $200 \mathrm{V}$ (rms) AC mains in series with a capacitor, as shown. What is the final voltage $V$ across the capacitor?

What is a junction diode? What is meant by forward-bias and reverse-bias in the case of p-n junction diode? Distinguish between the two biases.

With reference to a semiconductor diode, what is meant by forward bias?