Question

A negligibly small current is passed through a wire of length 15 m
and uniform cross-section 6.0 x 10 m. and its resistance is
measured to be 5.0 N. What is the resistivity of the material at the
temperature of the experiment?
Asierre​

Answer 1

AnswEr:-

• The resistivity of the material is 2× 10-7 Ω m.

Explanation:-

Length of the wire l = 15 m

Area of cross section of the wire a= 6.0×10^{-7} m²

Resistance of the material of the wire, R = 5.0 Ω

Resistivity of the material of the wire= p

Now,

Resistance is related with resistivity as

→ R = pl/A

→ p = RA/l

→ 5×6× 10^-7 / 15

→ 2× 10^-7 Ω m

$\huge\ddot{\smile}$