Mccleod282
Answered

Discover a world of knowledge at Westonci.ca, where experts and enthusiasts come together to answer your questions. Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform. Experience the convenience of finding accurate answers to your questions from knowledgeable experts on our platform.

What is the resistance of a 20.0-meter-long
tungsten rod with a cross-sectional area of
1.00 × 10^−4 meter2 at 20°C?
(1) 2.80 × 10^−5 Ω (3) 89.3 Ω
(2) 1.12 × 10^−2 Ω (4) 112 Ω

Sagot :

Answer:

Option (2)

Explanation:

The resistance of a conductor is directly proportional to the length of the conductor and inversely proportional to the area of the conductor. The formula for the resistance is given by

[tex]R = \rho \frac{l}{a}[/tex]

Where, ρ is the resistivity of tungsten, l be the length of tungsten and a be the area of cross section.

The value of resistivity for tungsten is 5.6 x 10^-8 ohm metre.

[tex]R = 5.6\times 10^{-8} \times \frac{20}{10^{-4}}[/tex]

[tex]R = 1.12 \times 10^{-2} Ohm[/tex]

The resistance of a 20.0-meter-long tungsten rod will be 1.12 ×10⁻² ohm.

What is resistance?

Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.

The given date in the problem is;

R is the resistance=?

L is the length = 20.0 m

A is the area= of 1.00 ×10⁻⁴

The resistance to the given condition is found by;

[tex]\rm R= \frac{\rho L}{A} \\\\ \rm R= \frac{5.6 \times 10^-8 \times 20 }{1.0\times 10^{-4}} \\\\\rm R=1.12 \times 10^{-2} \ Ohm[/tex]

Hence the resistance of a 20.0-meter-long tungsten rod will be 1.12 ×10⁻² ohm.

To learn more about the resistance refer to the link;

https://brainly.com/question/20708652

We hope this information was helpful. Feel free to return anytime for more answers to your questions and concerns. We appreciate your time. Please come back anytime for the latest information and answers to your questions. Get the answers you need at Westonci.ca. Stay informed by returning for our latest expert advice.