All categories

3 years ago

Establish the relation between current density and electron drift velocity?

1 answer:

7 0

Answer:the drift velocity is directly proportional to current. The drift velocity is the average velocity that a particle, such as an electron, attains in a material due to an electric field. In general, an electron will propagate randomly in a conductor at the Fermi velocity.Mar 11, 2017

You might be interested in

A 30-km, 34.5-kV, 60-Hz, three-phase line has a positive-sequence series impedance z 5 0.19 1 j0.34 V/km. The load at the receiv

zmey [24]

Answer:

(a) With a short line, the A,B,C,D parameters are:

A = 1pu B = 1.685∠60.8°Ω C = 0 S D = 1 pu

(b) The sending-end voltage for 0.9 lagging power factor is 35.96 $KV_{LL}$

Explanation:

(a)

Considering the short transition line diagram.

Apply kirchoff's voltage law to the short transmission line.

Write the equation showing the relations between the sending end and the receiving end quantities.

Compare the line equations with the A,B,C,D parameter equations.

(b)

Determine the receiving-end current for 0.9 lagging power factor.

Determine the line-to-neutral receiving end voltage.

Determine the sending end voltage of the short transition line.

Determine the line-to-line sending end voltage which is the sending end voltage.

(c)

Determine the receiving-end current for 0.9 leading power factor.

Determine the sending-end voltage of the short transition line.

Determine the line-to-line sending end voltage which is the sending end voltage.

8 0

3 years ago

A basic physics question

Anna71 [15]

No,kinetic energy cannot be negative since its given by KE=mv²,mass cannot be negative and the square of speed cannot b negative.

Yes,any force opposing motion or displacement does negative work. They are often referred to as resistive forces (friction,air resistance,drag...)

Nope it does not, it just forces the object to move in a circular path known as a centripetal force. It can accelerate an object by changing it's direction but not it's speed.

No it cannot,If an object is sliding on the table (assuming it is not an incline), then most probably that normal force cancels out the weights effect or assuming there is an incline, it cancels the weight's y component.

$w = f.d.cos \alpha = f.d.cos90 = 0$

The work done is zero

$w = f.d.cos \theta = f.d.cos0 = f.d$

The work is just the product of the magnitude of the force exerted and the displacement of the object.

$0 < \theta < 90 \\ 1 < cos \theta < 0$

<h3>Work is decreasing but positive</h3>

$\theta = 90 \\ cos \theta = cos90 = 0$

$90 < \theta < 180 \\ 0 < cos \theta < - 1$

<h3>Work is negative</h3>

3 0

2 years ago

Against the park ranger's advice, a visitor at a national park throws a stone horizontally off the edge of a 83 m high cliff and

KATRIN_1 [288]

The answer it would be 164 m

6 0

2 years ago

PLEASE HELP!!!!

OLEGan [10]

The story that fits the graph is; he elevator moves up, is stationary for a while, then moves down at a slower rate.

<h3>What is a position time graph?</h3>

The term position time graph shows us how the position of the object is changing with time. The position in this case has to do with the exact point in space where the object can be found. We have here an elevator that could be found at various points.

We now have to turn to the graph and see how the graph can be able to give a description of the motion of the elevator. If we look at the position time graph, it tends to move up and then remain at a point for some time before it moves down.

Based on the analysis that we have made above, we can now look out for any of the stories that fits the description that we have just made here.

Learn more about position time graph:brainly.com/question/13693087

#SPJ1

6 0

1 year ago

In phase E, from what direction is the sun shining?

Zanzabum

Heyo,

Your answer is West

if this question helped can you mark me brainliest

8 0

3 years ago

Read 2 more answers