# NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 7

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**Q 38** Consider a box with three terminals on top of it as shown in Fig.(a):

Three components namely, two germanium diodes and one resistor are connected across these three terminals in some arrangement. A student performs an experiment in which any two of these three terminals are connected in the circuit shown in Fig. (b).

The student obtains graphs of current-voltage characteristics for unknown combination of components between the two terminals connected in the circuit.

The graphs are

1. When A is positive and B is negative

2. When A is negative and B is positive

3. When B is negative and C is positive

4. When B is positive and C is negative

5. When A is positive and C is negative

6. When A is negative and C is positive

From these graphs of current – voltage characteristic shown in Fig. (c) to (h), determine the arrangement of components between A, B and C.

Ans: