The resistance of a conductor of length x Is r.If it's area of cross section is a,what is its resistivity?what is its unit?
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Answered by
48
R = resistance,
P = a constant which is of the characteristics of the material of the wire and is called the specific resistance,
l = length.
§ = directly proportional to
r = radius
R § l
R § 1/ a or R § p l/ a = p l/pie x square of r
unit of p = unit of R x unit of a / unit of l
ohm x metre square/metre
The unit is ohm x metre
P = a constant which is of the characteristics of the material of the wire and is called the specific resistance,
l = length.
§ = directly proportional to
r = radius
R § l
R § 1/ a or R § p l/ a = p l/pie x square of r
unit of p = unit of R x unit of a / unit of l
ohm x metre square/metre
The unit is ohm x metre
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Answered by
6
Explanation:
Resistivity is,
\frac{ra}{x}
x
ra
unit of Resistivity : Ohm m
Explanation:
Resistance (R) = Resistivity × length / Area
Rearranging,
we get, Resistivity (rho) = R × A / L
substituting given values,
where, R = r
A = a
L = x
we get,
rho = r × a / x
Resistivity unit is always ohm m (ohm meter)
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