Discussion

Match List-I with List-II :

List I	List II
(a) Drift current	(1) Ideal current when V_D is negative
(b) Diffusion current	(2) A current when there is an electric field
(c) \(I_{D} \approx I_{S}\, e^{qV_{D}/\eta kT}\)	(3) A current when there is concentration difference for either the electrons or holes or both
(d) \(I_{D} \approx -I_{S}\)	(4) Ideal current when V_D is positive

Answer: B

The correct matching is a-2, b-3, c-4, d-1.

(a) Drift current flows when there is an electric field that pushes carriers (2).
(b) Diffusion current flows when there is a concentration difference of electrons, holes or both (3).
(c) \(I_{D} \approx I_{S} e^{qV_{D}/\eta kT}\) is the ideal diode current when V_D is positive and much larger than \(\eta kT/q\) (4).
(d) \(I_{D} \approx -I_{S}\) is the ideal current when V_D is negative: the exponential term vanishes and only the reverse saturation current remains (1).

The last option has a and b right but swaps the forward and reverse expressions, and the others misplace the two kinds of current.

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