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A copper wire (resistivity ) has a diameter of
PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
A copper wire (resistivity
1.7
×
10
−
8
Ω
m
1.7\times10^{-8}\,\Omega\,\text{m}
1.7
×
1
0
−
8
Ω
m
) has a diameter of
0.50
mm
0.50\,\text{mm}
0.50
mm
. What length of this wire is needed to make a
2
Ω
2\,\Omega
2
Ω
resistor? (a)
29
m
29\,\text{m}
29
m
(b)
92
m
92\,\text{m}
92
m
(c)
23
m
23\,\text{m}
23
m
(d)
12
m
12\,\text{m}
12
m
Related theory
Resistance & Resistivity
Resistivity and factors affecting resistance
Resistance: geometry and temperature dependence
Current Electricity
Resistivity of materials
Electricity
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