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Fittoniya [83]
3 years ago
6

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

Physics
1 answer:
Burka [1]3 years ago
8 0

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

#learnwithBrainly

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An ideal ammeter would have zero resistance while an ideal voltmeter would have infinite resistance, why?.
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Explanation: To find the answer, we need to know about the Ammeter and Voltmeter.

<h3>What is an ammeter?</h3>
  • An ammeter is a device, that can be used to measure the electric current flows through a circuit in amperes.
  • An ideal ammeter would have zero resistance, because to ensure that, there is no voltage drop due to the internal resistance when it is connected in series to measure the current.
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  • An ideal voltmeter would have infinite resistance, because to ensure that there is no current is drawn by the voltmeter, when it is connected in parallel to measure the voltage.

Thus, we can conclude that, an ideal ammeter would have zero resistance, because to ensure that, there is no voltage drop due to the internal resistance. Similarly, an ideal voltmeter would have infinite resistance, because to ensure that there is no current is drawn by the voltmeter.

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