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Q.

For extrinsic semiconductors, when doping level is increased;

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a

Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type Semiconductor will go upward

b

Fermi-level of both p-type and n-type semiconductors will go upward for T>TF K and Downward T

c

Fermi – level of p and n-type semiconductors will not be affected.

d

Fermi-level of p-type semiconductors will go upward for Fermi-level of n-type Semiconductors will go downward.

answer is A.

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Detailed Solution

when doping level is increased Fermi level moves down in p- type and moves up in n - type
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