(a) With proper diagram, explain the movement of charge carries through

different parts of the transistor and hence show that ${\mathbf{I}}_{\mathbf{E}}\mathbf{=}{\mathbf{I}}_{\mathbf{B}}\mathbf{+}{\mathbf{I}}_{\mathbf{c}}\mathbf{.}$

(b) Identify the logic operation carried out by the circuit shown below and

write its truth table.

(a) Circuit diagram (1)

NCERT page no. 492 (explanation:2)

(b) NCERT page no. 511Q.No.14.17 Logic operation (1) Truth table (1)

Difficulty Level: