Question

the resistance of a wire of 0.01 cm radius is 10 Ω. if the resistivity of the material of the wire is $\sf{50 \times {10}^{ - 8}}$ Ω.m, find the length of the wire​.

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Answer 1

Answer:

Given:

⠀⠀⠀⠀⠀Resistance = 10 ohm

⠀⠀Radius of wire = 0.01 cm

⠀⠀⠀⠀⠀⠀⠀⠀= 0.01x10^-2

⠀⠀⠀⠀Resistivity = 50x10^-8 ohm metre.

⠀Formula:

⠀⠀⠀⠀Length = Resistance$\times$ area/Resistivity

⠀⠀⠀⠀⠀Area = 3.14x10^-8 sq.m

So length = 10*3.14x10^-8/50x10^-8

⠀⠀⠀⠀⠀⠀= 31.4/50

⠀⠀⠀⠀⠀= 0.628 m

Answer 2

Explanation:

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