Physics
Grade-9
Easy
Question
A copper cable has a length of 450 m and a cross-sectional area of 4.0 mm2. If the resistivity of the copper is 1.72 ×10-8 Ohm-m, then the resistance of this cable will be:
- 193.5 Ω
- 0 Ω
- 1.050 Ω
- 1.935 Ω
Hint:
R = 
The correct answer is: 1.935 Ω
Given,
length of the wire = 450 m
cross-sectional area = 4.0 mm2 = 4 x 10-6 m
resistivity = 1.72 x 10-8 ohm-m
We know that,
R =
R = 1.72 x 10-8 
R = 1.935 
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