Question

find the length of nichrome wire of resistivity 100*10-6ohm-m of cross section 1mm ²to yield a resistance of 10 ohm​

Answer 1

1 x 10⁻¹¹m²

Explanation:

Given parameters:

Resistivity = 100 x 10⁻⁶Ohm.m

Cross-section = 1mm²

Resistance = 10ohm

Unknown:

length of the nichrome wire = ?

Solution:

To find the length of the nichrome wire, we use the expression below:

       L = $\frac{RA}{P}$

where l is the length of the wire

          R is the resistance of the wire

            A is the area

             p is the resistivity

Now we need to convert area from mm to m;

     1000mm = 1 m

  1mm² = 1 x $\frac{1m}{1000mm} x \frac{1m}{1000mm}$ = 1 x  10⁻⁶m²

Input the values in the formula;

   L = $\frac{100 x 10^{-6} x 1 x 10^{-6} }{10}$ = 1 x 10⁻¹¹m²

learn more:

Resistivity brainly.com/question/12246020

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