(a) What do you understand by the " resistivity" of a substance
(b) A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω Calculate the resistivity of its material?
(a) What do you understand by the " resistivity" of a substance
(b) A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω Calculate the resistivity of its material?
(a)
Resistivity or specific resistance of a body is a characteristic by which one can judge the electrical property of a substance. As the name suggests, resistivity is associated with the resistance to electrical flow of electrons. Resistivity quantifies how strongly a material opposes the flow of electrons through it.
If a material has low resistivity, it means it offers less resistance to the electric current. This implies that a material with low resistivity has highly conductive. For example, Silver!
In terms of definition, resistivity is defined as the resistance of a of a material of unit cross section and unit length.
We know that resistance can be written as:
R = ρ L/A
Where ρ is a the resistivity of the substance.
This clearly means that.. resistivity of a substance is moreover same for any length or cross section area, whereas the resistance can vary!
(b)
(a)
Resistivity or specific resistance of a body is a characteristic by which one can judge the electrical property of a substance. As the name suggests, resistivity is associated with the resistance to electrical flow of electrons. Resistivity quantifies how strongly a material opposes the flow of electrons through it.
If a material has low resistivity, it means it offers less resistance to the electric current. This implies that a material with low resistivity has highly conductive. For example, Silver!
In terms of definition, resistivity is defined as the resistance of a of a material of unit cross section and unit length.
We know that resistance can be written as:
R = ρ L/A
Where ρ is a the resistivity of the substance.
This clearly means that.. resistivity of a substance is moreover same for any length or cross section area, whereas the resistance can vary!
(b)
