A wire 40cm long and diameter 12mm has a resistance of 2ohms. What is the rasistivity of the material of which it is made?(take π=3.142)
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2
Answer:
Correct option is
B
2.514×10
−7
Ωm
Given : R=2Ω l=1 m d=0.4 mm =0.0004 m
Cross section area of wire A=
4
πd
2
=
4
π×(0.0004)
2
=1.256×10
−7
m
2
Resistivity of the material ρ=
l
RA
∴ ρ=
1
2×1.256×10
−7
=2.514×10
−7
Ωm
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