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Questions  

For an extrinsic semiconductor if doping concentration is increased then

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.

detailed solution

Correct option is B

The variation of the fermi level obeys two conditions. → The mass action law→ The neutrality equation.

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