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Based on the band theory of solids, How would you distinguish between conductor and semiconductor?

What is meant by charge carrier hole in a semiconductor? Can it be created in a conductors?

The output of two input AND gate is fed to NOT gate. Draw the logic circuit of the combination of gates.

How does the conductivity of semiconductor varies with temperature? Explain.

In a transistor, emitter-base junction is always forward biased. why?

Explain the action of a diode value as a full wave rectifier.

What do you understand by Zener diode? How can this be used as voltage regulator?