Question

Copper wire diameter is 0.5mm resistivity 1.6×10-8ohmm. how much wire used in 10ohm.

Answer 1

The length of the wire used is L = 122.656 m

Explanation:

Given data:

• Diameter of copper wire = 0.5 mm = 5 × 10-⁴ m
• Resistivity = 1.6 × 10^-8 ohm.m
• Resistance = 10 ohm
• Length = ?

we know that:

R = d x L/A

where R , d , L and A are resistance , resistivity , length and cross section area of the wire.

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

Thus the length of the wire is L = 122.656 m

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A wire of length 10 m and diameter 2 mm elongates 0.2 mm when stretched by a weight of  0.55 Kg . Calculate the young's modulus of the material of the wire?

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Answer 2

Answer:Diameter =0.5mm

Pie r^2=0.5mm=0.0005m

R=10ohm

We know that

R=pl/A

L=RA/p

The answer=122.78m

Explanation:this answer may help u