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Q.

For an extrinsic semiconductor if doping concentration is increased then

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a

For N type and P-type fermi level will increase if T > Tf (T=temp of semi-conductor, Tf = fermi Temp.)

b

For N type fermi level will increase and for P type fermi level will decrease.

c

For N-type fermi level will decrease and for P-type fermi level will increase.

d

For N-type fermi level will decrease and for P-type fermi level will decrease.

answer is B.

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Detailed Solution

The variation of the fermi level obeys two conditions. → The mass action law→ The neutrality equation.
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For an extrinsic semiconductor if doping concentration is increased then