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

     different parts of the transistor and hence show that IE=IB+Ic.

(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)

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