As the temperature increases, the electrical resistance:
- Increases for both conductors and semiconductors
- Decreases for both conductors and semiconductors
- Increases for conductors but decreases for semiconductors
- Decreases for conductors but increases for semiconductors
The Correct Option is C
Solution and Explanation
To solve the given question related to the effect of temperature on the electrical resistance of conductors and semiconductors, let's analyze with respect to their principles of operation:
Understanding Electrical Resistance: Electrical resistance is a measure of the degree to which an object opposes the flow of electric current. The resistance depends on the material's nature and temperature, among other factors.
Conductors: In conductors, as temperature increases, the atoms in the material vibrate more vigorously, causing greater scattering of the free electrons. This increased scattering leads to a higher resistance. Thus, for conductors, resistance increases as temperature rises.
Semiconductors: On the other hand, semiconductors behave differently. As temperature increases, more charge carriers (electrons and holes) are generated within the material, resulting in an increase in conductivity. Consequently, the resistance for semiconductors decreases with an increase in temperature.
Therefore, the correct statement according to the change in electrical resistance with temperature is:
Correct Answer: Increases for conductors but decreases for semiconductors
Explanation of Other Options:
- Increases for both conductors and semiconductors:Incorrect, because semiconductors exhibit decreased resistance with increasing temperature.
- Decreases for both conductors and semiconductors:Incorrect, because conductors exhibit increased resistance with increasing temperature.
- Decreases for conductors but increases for semiconductors:Incorrect, since the behavior of temperature on resistance is opposite for both types of materials.
This behavior of conductors and semiconductors is a fundamental concept in physics and materials science relevant to temperature change and resistance.
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Concepts Used:
Electric charges and field
What is Electric Charge
It is the property of subatomic particles that experiences a force when put in an electric and magnetic field.
What is Electric Field
It is a property associated with each point in space when charge is present in any form. The magnitude and direction of the electric field are expressed by E, called electric field strength or electric field intensity.
Electric charges are of two types: Positive and Negative. It is commonly carried by charge carriers protons and electrons.
Properties of Electric Charge
Various properties of charge include the following :-
- Additivity of Electric Charge
- Conservation of Electric Charge
- Quantization of Electric Charge
Types of electric charge
Two kinds of electric charges are there :-
Negative Charge - When an object has a negative charge it means that it has more electrons than protons.
Positive Charge - When an object has a positive charge it means that it has more protons than electrons.
When there is an identical number of positive and negative charges, the negative and positive charges would cancel out each other and the object would become neutral.