A wire has a diameter of 1 mm and a resistivity
of 1.6 x 102 cm. Find the length of this
wire required to make a 10 2 coil. [4]
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Answer:
Given,
diameter of copper wire = 0.5mm = 5 × 10-⁴ m
resistivity = 1.6 × 10^-8 ohm.m
resistance = 10 ohm
Length = ?
we know,
R = dL/A
where R , d , L and A are resistance , resistivity , length and cross section area.
10 = 1.6 × 10^-8 × L/(πr²)
L = 10 × 3.14 × (2.5 × 10^-4)² × 10^8/1.6
L = 10× 3.14 × 6.25/1.6
L = 122.656 m
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Explanation:
What will be the length of this wire to make its resistance 10 Ω? How ... mm = 0.5 × 10−3 m = 5 × 10−4 m Radius = r = Diameter/2 = (5 × ... 6, 2019 by Teachoo ... A copper wire has a diameter 0.5 mm and resistivity of 1.6 × 10–8 Ω m. ... (A/) To find l, first we need to find A Finding Area of cross - section ...
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