Question

The unit of electrical resistivity is

Answer 1

Answer:

Ω m (ohm metre)

Explanation:

We know that

Resistance R :-

R ∝ l ( l is the length of wire)

R ∝ 1/A (A is the area of the cross section of the wire)

⇒ R = ρ(l/A) (ρ is the constant of the proportionality and it is the resistivity of the material)

From here, we get

ρ = $\sf \frac{RA}{l}$

Putting the units of R, A and l we get

ρ = Ω m²/m

⇒ ρ = Ωm

So, the unit of resistivity or specific resistance is Ωm

[Resistivity is also known as Specific Resistance]

Answer 2

Answer:

ohm metre

Explanation:

resitivity or specific resistance is resistance of a body having unit length and unit area of cross section.

specific resistance =Ra/l

=ohm m^2/m= ohm m