Question

calcula
te the resistar per metre at room!
temperature of constantan wire of
diametre 1.25. The resitivity of constantan
at room temprature is 5x10 res to -7 ohem meter.
​

Answer 1

Correct Question:

Calculate the resistance per meter at room temperature of a constantan wire of diameter 1.25 m. The resistivity of the constantan wire at room temperature is 5 × 10⁻⁷ ohm meter.

Solution:

$\text{Resistance} = \dfrac{\text{Resistivity}\times\text{Length}}{\text{Area of Cross Section}}$

According to the question,

• Resistivity = 5 × 10⁻⁷ ohm meter
• Length = 1 meter
• Area of Cross Section = πd²/4 = 1.23 m²

Substituting we get,

$\implies\text{Resistance} = \dfrac{ 5 \times 10^{-7} \times 1}{1.23}\\\\\implies \boxed{\text{Resistance} = 4.065 \times 10^{-7} \text{ohms}}$

Answer 2

Explanation:

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