Question

if a negligible is small current is passed through a wire of length 15 metre and of resistance 5 ohm having uniform cross section of 6 into 10 raise to minus 7 square then can coefficient of resistivity of material is


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Answer 1

Answer:

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 = ÃÂ

Resistance is related with the resistivity as

Therefore, the resistivity of the material is 2 × 10 - 7 Ω

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Answer 2

Q]___?

=> 2× 10^-7

Explanation:

Resistance of a given conducting wire is given by

R =ρ 1 /A

where ρ is the specific resistance of the material of the conductor.

Here,

l = 15m

A= 6× 10^-7 m^2

R= 5 Ω, ρ = ?

ρ = RA / I

ρ = ( 5 × 6 × 10^-7 ) / 15

ρ = 2 × 10^-7 Ω-m

∴ The coefficient of resistivity of material is 2 × 10^-7 Ω-m !