Which of the following option is correct in a region of constant potential?
In a region of constant potential (V = constant) , E=-dVdr=0, i.e., electric field is zero. As E=0, there can be no charge inside the region. Choices (b) and (c ) are correct.
Which of the following is wrong about a conductor?
So, resistivity of a conductor is directly proportional to temperature. So, option \(A\) and \(B\) are wrong. Resistivity of the conductor is highest for insulator, intermediate for semiconductor and least for conductor. So, option \(D\) is correct.
Which of the following is wrong resistivity is a conductor?
It is again wrong. Resistivity is directly proportional to the temperature. It is true. Resistivity of conductors is less than that of semiconductors.
On what factors resistivity of a conductor depends?
Note: The resistivity of a conductor depends only on the above mentioned three factors i.e., length, area of cross-section, and nature of the material of the conductor. Additionally, it also depends upon the physical conditions like temperature and pressure but is independent of its shape and size.
What is meant by resistivity of a conductor?
Resistivity, electrical resistance of a conductor of unit cross-sectional area and unit length. A characteristic property of each material, resistivity is useful in comparing various materials on the basis of their ability to conduct electric currents.
Is directly proportional to the length and resistivity of the conductor?
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor.
What is the effect of temperature on resistivity?
As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up. For some materials, resistivity is a linear function of temperature. The resistivity of a conductor increases with temperature.
What is resistance What are the factors affecting resistance?
Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material.
What common factors affect resistance?
The common factor is Nature of Material because the value of resistivity vary from material to material meanwhile the value of resistance is also different for different materials. Aakash EduTech Pvt.