1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zielflug [23.3K]
3 years ago
15

A 14.0 gauge copper wire of diameter 1.628 mm carries a current of 12.0 mA . A) What is the potential difference across a 1.80 m

length of the wire?
B) What would the potential difference in part A be if the wire were silver instead of copper, but all else was the same?
Physics
2 answers:
Serga [27]3 years ago
8 0

Answer: a) 139.4 μV; b) 129.6 μV

Explanation: In order to solve this problem we have to use the Ohm law given by:

V=R*I whre R= ρ *L/A  where ρ;L and A are the resistivity, length and cross section of teh wire.

Then we have:

for cooper R=1.71 *10^-8* 1.8/(0.001628)^2= 11.61 * 10^-3Ω

and for silver R= 1.58 *10^-8* 1.8/(0.001628)^2=10.80 * 10^-3Ω

Finalle we calculate the potential difference (V) for both wires:

Vcooper=11.62* 10^-3* 12 * 10^-3=139.410^-6 V

V silver= 10.80 10^-3* 12 * 10^-3=129.6 10^-6 V

mariarad [96]3 years ago
8 0
<h2>Answer:</h2>

(a) 1.788 x 10⁻⁴V

(b) 1.524 x 10⁻⁴V

<h2>Explanation:</h2>

The resistance (R) of a wire is related to the resistivlty (ρ) of the wire material, the length (L) of the wire and the cross-sectional area (A) of the wire as follows;

R = ρL / A.          ---------------------(i)

And;

The current (I) flowing through a wire is directly proportional to the potential difference (V) across the wire according to Ohm's law as follows;

V = I x R          ---------------------(ii)

<em>(a) Now, according to the first part of the question, the following are given;</em>

L = 1.80m

diameter d = 1.628mm = 0.001628m

current (I) = 12.0 mA = 12.0 x 10⁻³A

<em>From the diameter, we can get the area (A) of the wire as follows;</em>

A = π d² / 4           [Take π = 3.142 ]

A = 3.142 x 0.001628² / 4

A = 2.08 x 10⁻⁶ m²

<em>Substitute the values of L and A into equation (i) as follows;</em>

R = (ρ x 1.80) / (2.08 x 10⁻⁶)

<em>where ρ = resistivity of copper wire = 1.72 x 10⁻⁸ Ωm</em>

R = 1.72 x 10⁻⁸ x 1.80 / (2.08 x 10⁻⁶)

R = 1.49 x 10⁻² Ω

<em>Substitute the value of R into equation (ii) as follows;</em>

V =  I x R

V = 12.0 x 10⁻³ x 1.49 x 10⁻²

V = 17.88 x 10⁻⁵

V = 1.788 x 10⁻⁴V

Therefore, the potential difference across the length of copper wire is 1.788 x 10⁻⁴V

<em>(b) If the wire were a silver, we will go through the same process as above except that the resistivity (ρ) will be that of silver which is 1.47 x 10⁻⁸ Ωm.</em>

<em></em>

<em>Substitute the values of L and A into equation (i) as follows;</em>

R = (ρ x 1.80) / (2.08 x 10⁻⁶)

<em>where ρ = resistivity of silver wire = </em>1.47 x 10⁻⁸<em> Ωm</em>

R = 1.47 x 10⁻⁸ x 1.80 / (2.08 x 10⁻⁶)

R = 1.27 x 10⁻² Ω

<em>Substitute the value of R into equation (ii) as follows;</em>

V =  I x R

V = 12.0 x 10⁻³ x 1.27 x 10⁻²

V = 15.24 x 10⁻⁵

V = 1.524 x 10⁻⁴V

Therefore, the potential difference across the length of silver wire is 1.524 x 10⁻⁴V

You might be interested in
Contact force that acts to resist sliding between two touching surfaces
Black_prince [1.1K]
I think that the answer is friction 
3 0
3 years ago
Natural causes are the reason for the recent warming trend of the average global temperature.
kogti [31]
The reasoning for this is false
8 0
3 years ago
What is helpful in calculating standard deviation?
Oksana_A [137]
<span>Standard deviation is a calculation. It I used in statistical analysis of a easier job. hoped this helps u </span>
4 0
3 years ago
Calculate the change in total internal energy for a system that releases 2.59 × 104 kJ of heat and does 6.46 × 104 kJ of work on
mrs_skeptik [129]

Answer:

See explanation below

Explanation:

The equation to use for this is the following:

dU = q + w

As the heat is being release, this value is negative, and same here happens with the work done, because it's in the surroundings.

Therefore the change in the energy would be:

dU = -2.59x10^4 - 6.46^4

dU = -9.05x10^4 kJ

8 0
3 years ago
Which is the one factor that adds to the greenhouse effect? 1. a decrease in the amount of dust in the atmosphere 2. a decrease
lukranit [14]

Answer:

an increase in gasses that absorb heat

Explanation:

Greenhouse effect refers to the gradual increase in the earth's temperature due to an increase in the concentration of certain gases in the atmosphere. These gases are called greenhouse gases and they include; water vapour, nitrogen 1 oxide, carbon IV oxide etc. Green house effect is said to occur when heat radiating outwards from the earth surface towards space is trapped close to the earth's surface due to the presence of greenhouse gases in the atmosphere.

Greenhouse effect leads to increase in the temperature of the earth, melting of polar ice caps and possibly flooding due to a rise in sea levels.

Greenhouse gases act as glass in a greenhouse. They allow heat to pass through onto the earth surface but trap the heat and prevent it from being radiated outwards back to space. Thereby increasing the surface temperature of the earth.

8 0
3 years ago
Read 2 more answers
Other questions:
  • A quarterback throws a football at 40.0 km/hr to a receiver 50.0 yd away. How much time does it take the football to reach the r
    12·1 answer
  • An airplane flies at 400 km/h in a 100km/h hurricane crosswind. Find the resultant speed of the plane.
    6·1 answer
  • A gas is compressed from 600cm3 to 200cm3 at a constant pressure of 450kPa . At the same time, 100J of heat energy is transferre
    14·1 answer
  • A piece of plastic has a net charge of +9.9 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60
    10·1 answer
  • If the stopping potential of a metal when illuminated with a radiation of wavelength 480 nm is 1.2 V, find (a) the work function
    7·1 answer
  • What do you see when you stand infront of a concave mirror, beyond its focal point, and look at yourself?
    9·2 answers
  • Calculate the displacement traveled (in m) from start to finish.
    12·2 answers
  • 10.
    14·2 answers
  • A ball is thrown with 50J of kinetic energy, it hits a target which moves with 30J of kinetic energy, how much energy goes to th
    15·1 answer
  • I cant solve this problem, and our teacher said that this would be in the test we'll have tomorrow, can someone help me?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!