(a) State what is meant by an extrinsic semiconductor(b) Figure 12 shows a depletion layer in an unbiased p-n junction State how a battery can be used to make the depletion layer narrower.(c) Figure 13 shows an incomplete circuit of a full wave rectifier.(i) Draw in the figure two more diodes to complete the circuit.(ii) Show on the figure the points across which the output of the rectifier should be obtained.
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