Question

the resistivity of a metal wire is 10 into 10 ohm metre at 20 Celsius find the resistance of the same wire of 2 metre length and 0.2 mm thickness

Answer 1

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12th

Physics

Current Electricity

Electrical Resistance & Resistivity

Resistance of a metal wire ...

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Asked on December 26, 2019 by

Angèliña Kadam

Resistance of a metal wire of length 1 m is 26Ω at 20

∘

C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature? Using Table 12.2. predict the material of the wire.

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ANSWER

R=26 Ω

l=1m

d−0.3mm

r=

2

d

=

2

0.3×10

−3

=0.15×10

−3

m

A=πr

2

=3.14×(0.15×10

−3

)

2

=0.071×10

−6

m

2

R=

A

ρL

or ρ=

l

RA

=

1

26×0.071×10

−6

=1.84×10

−6

Ωm

Answer 2

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