The diode voltage is $0.5 \ V$ and the maximum power rating is $100 \ mW$. To obtain the maximum current in the circuit,the value of $R$ should be .......... $\Omega$.

The junction diode in the following circuit requires a minimum current of $1 \, mA$ to be above the knee point $(0.7 \, V)$ of its $I-V$ characteristic curve. The voltage across the diode is independent of current above the knee point. If $V_B = 5 \, V$,then the maximum value of $R$ so that the voltage is above the knee point will be:

$A$ $2 \ V$ cell is connected across points $A$ and $B$ as shown in the figure. Assume that the resistance of each diode is zero in forward bias and infinity in reverse bias. The current supplied by the cell is (in $A$)

In the given figure,three silicon diodes are connected in series. What voltage at point $X$ will make all three diodes forward-biased?

What is the current in the circuit shown below?

For an ideal diode,in forward and reverse biased condition the resistance is respectively