The barrier potential in a $P-N$ junction is maximum in-

The current through an ideal $PN-$junction. shown in the following circuit diagram will be

In the circuit given below, the value of the current is

The circuit shown in the figure contains two diodes each with a forward resistance of $50 \mathrm{ohm}$ and with infinite reverse resistance. If the battery voltage is $6 \mathrm{V},$ find the current through the $100 \mathrm{ohm}$ resistance 

Four equal resistors, each of resistance $10 \mathrm{ohm}$ are connected as shown in the adjoining circuit diagram. Then the equivalent  resistance between points $A$ and $B$ is