Question

Resistance of a metal wire of length 2 m is 35 ohm at 30 digree centigrade if the diameter of the wire is 0.4mm what will be the resistivity of the metal at that temperature??

Answer 1

believe me im gonna make this question seem so easy to u

just plz mark as brainliest for Thanking me

plzzzzz

Answer 2

Answer: 2.275 ×10⁻⁶ Ω-m

Explanation:

Resistance of a metal wire is given by:

$R = \frac{\rho \times l}{A}$

where ρ is the resistivity, l is the length of the wire and A is the area of the cross-section.

It is given that, R = 35 Ω

length, l = 2 m

Diameter of area, d = 0.4 mm

Radius, r = 0.2 mm

Area of the wire, A = 0.13 ×10⁻⁶ m²

Thus, ρ = ( R × A)/ l = (35 Ω ×0.13 ×10⁻⁶ m²)÷2 m = 2.275 ×10⁻⁶ Ω-m