Ohm’s Law and Semiconductors – Rankers Physics

Properties of Semiconductors: Practice Problem & Solution

Assertion (A): Semiconductors do not obey Ohm's law. Reason (R): Electric current is determined by the rate of flow of charge carriers.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Properties of Semiconductors. Understanding the underlying formula is key to arriving at the correct answer below:

Concept: Ohm's Law and current definition.
Semiconductors are non-ohmic devices, so (A) is true. Electric current is indeed the rate of flow of charge, \(I = \frac{dQ}{dt}\), so (R) is true. However, (R) is a definition of current and does not explain why semiconductors are non-ohmic. Thus, (R) is not the correct explanation of (A).

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Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Consider the following statements: (a) At 0 K, semiconductor behaves as perfect conductor. (b) Semiconductors have negative temperature coefficient of resistance. Choose the correct statement.
2. Boolean expression for the truth table given below is (A and B are inputs and Y is output) \[\begin{array}{|c|c|c|} \hline A & B & Y \\ \hline 0 & 0 & 1 \\ \hline 0 & 1 & 0 \\ \hline 1 & 0 & 0 \\ \hline 1 & 1 & 0 \\ \hline \end{array}\]
3. p-n junction is said to be forward biased, when (1988)
4. Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be :
5. Assertion (A): Avalanche breakdown dominates when the doping concentration is high and depletion layer is thin. Reason (R): Zener breakdown occurs due to the collision of minority charge carrier.