GATE ECE concept:drift-current PYQs & Answers

Questions 1–2 of 2. Imported answers require independent review unless marked reviewed.

The free electron concentration profile

in a doped semiconductor at equilibrium is shown in the figure, where the points A, B, and C mark three different positions. Which of the following statements is/are true?

Diagram for Electronics and Communication Engineering question 26

Your answerSelect all correct options. You can choose more than one.

For

between B and C, the electron diffusion current is directed from C to B.

For

between B and A, the electron drift current is directed from B to A.

For

between B and C, the electric field is directed from B to C.

For

between B and A, the electric field is directed from A to B.

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In an extrinsic semiconductor, the hole concentration is given to be

where

is the intrinsic carrier concentration of

. The ratio of electron to hole mobility for equal hole and electron drift current is given as ______ (rounded off to two decimal places).

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GATE ECE concept:drift-current PYQs

How to practice concept:drift-current

Question 26

Question 56