6. The resistance of a conductor of
length x is r. If its area of cross-
section is a, what is its resistivity?
What is its unit?
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2
Answer:
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. The unit of resistance is the ohm.
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0
Answer:
In the usual notation,
R = P L = Resistivity P = RA
__ ____
A L
= Here, P = ra
___ Unit = Ωm
x
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