On heating a conductor its resistancea)depends on type of metalb)remains constantc)increasesd)decreasesCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

The resistance increases as the temperature of a metallic conductor increase, so the resistance is directly proportional to the temperature. When we increase the temperature the amplitude of vibration of atoms increases as a result of which the number of collision among the electrons and atom increases, and hence resistances increases.

Answer

Of course resistance increase

Answer

Rt=R` +€∆twhereRt=new resistanceR'=initial resistance€=temperature constant ∆t=change in temperatureit is a function of temperature

Answer

Introduction:
When a conductor is heated, its resistance undergoes a change. In this case, the correct answer is option 'C', which states that the resistance of the conductor increases. This phenomenon is known as the temperature coefficient of resistance and is applicable to most metals.

Explanation:
1. Temperature Coefficient of Resistance:
The temperature coefficient of resistance is a characteristic property of a material that describes how its resistance changes with temperature. It quantifies the change in resistance per degree Celsius change in temperature. The temperature coefficient of resistance is positive for most metals, which means that their resistance increases with an increase in temperature.

2. Atomic Vibrations and Electron Collisions:
When a conductor is heated, the atoms within the material start to vibrate more vigorously due to the increased thermal energy. These atomic vibrations can disrupt the flow of electrons, leading to an increase in resistance. As the temperature rises, the amplitude of atomic vibrations increases, causing more frequent collisions between electrons and atoms.

3. Increased Scattering of Electrons:
The collisions between electrons and vibrating atoms cause the electrons to scatter more frequently. This increased scattering leads to a higher probability of electron-atom collisions, hindering the flow of electrons and resulting in an overall increase in resistance.

4. Impact on Electron Mobility:
The increase in temperature also affects electron mobility within the conductor. Electron mobility refers to the ease with which electrons can move through a material. As the temperature rises, the lattice structure of the conductor expands, increasing the distance between atoms. This expansion restricts the movement of electrons, further contributing to the increase in resistance.

5. Mathematical Representation:
The relationship between resistance and temperature can be mathematically expressed using the temperature coefficient of resistance (α) as follows:
R2 = R1 * (1 + α * ΔT)
where R1 is the initial resistance, R2 is the final resistance after temperature change ΔT, and α is the temperature coefficient of resistance.

Conclusion:
In summary, when a conductor is heated, its resistance increases due to the increased atomic vibrations, electron scattering, and restricted electron mobility caused by the rise in temperature. This phenomenon is described by the positive temperature coefficient of resistance, which quantifies the change in resistance per degree Celsius change in temperature.

Answer

The kernels inside the conductor get more energy and start vibrating and they hinder the movement of  electrons and hence current decreases and resistance increases

Similar Class 12 Doubts

Value of Henry’s constant KH is _ _ _ _.

If the negative charge on oxygen atom increases its electronegativity

By increasing the temperature, the specific resistance of a conductor and a semiconductor

The resistivity (specific resistanc e) of a copperwire [2002]

Value of Henry’s constant KH is ______.

Top Courses for Class 12

Related Content

Schools

Competitive Examinations

Quick Access Links

Technical Exams