Category: Physics

: It is a good conductor of electricity.

: It doesn’t oxidised

: it is perfect elastic

: it is non magnetic

: it is very little elastic after effects

A wire of length (L) and resistance (R) is stretched so that it’s length is double and the area of cross section is halved. How will it.

Make sure your answer contains higher education references of physics

Mengapa roket harus terbang ke atas apakah ada penerapan fisika?

This is a question of Chapter electricity.

Given: Two charges +q and q

Distance between them = d

We need the electric field at the midpoint

Step 1: Direction of electric field

Electric field due to +q goes away from +q

Electric field due to q goes towards q

Step 2: At the midpoint

The midpoint is exactly between +q and q.

Field due to +q points away from +q, i.e., towards the midpoint

Field due to q points towards q, which is also same direction

So, both electric fields are in the SAME direction

Step 3: Resultant field

Since both fields are in the same direction, they add up

So, the net electric field is: Directed from +q to q

Final Answer:

Electric field is directe

d from +q to q

Three parallel conductors carry equal currents of $I=5.0\text{A}$I=5.0A. The first conductor is located at the origin of the cartesian plane and the current is pointing outside the screen. The second conductor is located 4 cm above the first conductor and its current is pointing inside the page. The third conductor is located 3 cm to the right of the first conductor. Determine the magnitude and the direction of the magnetic field at a point $P$ located 3.0 cm to the right of the second conductor and 4 cm above the third conductor.

Green plants use sunlight, water, and carbon dioxide to create their own food and energy.

Part 1: Lenses

Let’s experiment with some lenses via :

1. Select “Lens” from the simulation.
2. Play around a bit moving the pencil and observing how the image moves. Just get comfortable observing how the image reacts to moving the object.
3. Use the yellow reset button in the lower right.
   • Question 1: Describe the image of the pencil: is it larger or smaller than the object? It is closer or farther from the lens? If the image upright or inverted? Using the vertical ruler tool (upper right of the sim), measure the vertical lengths of the pencil and its image to verify/correct your answer. How long are the object and image?
4. Move the object up and down only- without horizontal motion.
   • If you need to, use markers or the vertical ruler to help in moving the object up and down only.
   • Question 2: How does the image change? Does the size change? Does the image flip? Anything else? Verify your answers with size measurements of the object and image.
5. Reset via the yellow button.
6. Move the object left somewhat.
   • Question 3: How did this affect the image?
7. Move the object to the right slightly.
   • Question 4: How did this affect the image?
8. Zoom all the way out via the minus magnifying glass button on the left.
9. Continue moving the object to the right until the image disappears.
   • Question 5: Where do you think the image went? What can you infer about the location of the image from the rays in the simulation?
   • Question 6: Where is the object relative to the focus (marked by the small yellow circle with a dot in the middle)?
10. Zoom all the way back in with the plus magnifying glass.
11. Keep moving the object to the right until you can see the image again.
    • Question 7: What did you observe?
    • Question 8: This type of lens is the same kind found in a magnifying glass. Based on your observations, what is the best way to use a magnifying glass if your goal is maximizing the size of the image?
      • Keep in mind: When using a magnifying glass, our eye and the object you are looking at are on opposite sides of the lens. What rays will your eye receive? Which setup lets you see the biggest image?
12. Reset via the yellow button.
13. Play with the index of refraction slider.
    • Question 9: What effect does index of refraction have on the ability of the lens to focus/bend light?
      • What direct relationships can be stated?
      • If the index of refraction increases, what happens?
      • If the index of refraction decreases, what happens?
14. Reset via the yellow button.
15. Play with the radius of curvature.
    • Question 10: What effect does the curvature have on the ability of the lens to focus/bend light?
      • What direct relationships can be stated?
      • If the curvature increases, what happens?
      • If the curvature decreases, what happens?
16. Reset via the yellow button.
17. Play with the diameter slider.
    • Question 11: What effect does lens size have on the ability of the lens to focus/bend light?
      • What direct relationships can be stated?
      • If the size increases, what happens?
      • If the size decreases, what happens?
    • Question 12: With everything that you have learned, what qualities can improve glasses lenses?
      • Consider: the weight of the lens, you don’t want heavy glasses, the thickness of the lens, the amount of light that the lens captures, how much it bends the light, etc
      • Please answer in terms seen in this lab.

Part 2: Total Internal Reflection

Find our second simulation, once again, at

Select the “Intro” tab and play around a bit to get a feel for the controls.

Hit the yellow reset button in the bottom right of the simulation.
Turn on the laser via the red button.
Adjust the incident angle of the red laser onto the surface of the water until the laser no longer enters the water.Question 13: Use the protractor to measure the incident angle. What is it? What does this mean in terms of light from outside the water entering the water?If you need help using the protractor, here is a short video explaining how to measure and an angle.
Note: Our protractor in this simulation is designed to measure the incident angle, so it has 0 degrees at the top/normal and the angle increases as you move away from that normal line.
Use the drop down menus to switch the water and air (water should now be in the top half, and air in the bottom half).
Again, adjust the incident angle of the red laser onto the surface of the air until the laser no longer enters the air.Question 14: Measure the incident angle. What is it and how is it different from what we saw in Q13?
Change the top medium to glass.
Again, adjust the incident angle of the red laser onto the surface of the air until the laser no longer enters the air.Question 15: Measure the incident angle. What is it and how is it different from what we saw in Q14?
This is the principle behind fiber optic cables. Feel free to do some reading on those as desired.Question 16: Other than breaking, why shouldn’t we wrap fiber optic cables too tightly when in use?

Please review the following detailed guidelines to help you

create a thorough and high-quality research proposal.

1. Purpose of the assignment

Develop a structured research proposal showing your ability to define a problem, review literature, design

methodology, and plan analysis and ethics.

2. Task description

Write a research proposal with these sections in order:

1. Abstract (150300 words)

* Include a brief background, main objectives, and concise proposed methods.

* Ensure the abstract is 150300 words.

2- Research Significance (max 200 words)

* Explain how your study will contribute to existing knowledge, inform policy, or enhance professional

practice in the field of disaster psychology.

* Highlight the research gap your study addresses and discuss the current relevance and urgency of your

chosen topic.

3- Research Objectives

* State 25 clear, specific, and measurable objectives.

* Objectives should logically follow the problem and lead into your methods.

* You may present them in English, as indicated in the template.

4- Literature Review

* Summarise key, recent, and relevant studies related to your topic (e.g., last 510 years where

possible).

* Organise your literature review by themes or key concepts rather than presenting it as a series of

article summaries.

* Show clearly how the literature leads to your research gap and objectives.

5- References (using reference manager software)

* Use a reference manager and an approved bibliography style (e.g., APA).

* Check for accuracy and consistency in your citations and reference list.

* Include enough recent, high-quality sources for your topic.

* Length: 812 pages (excluding title and references).

* Format: Word document, 1.5 spacing, 12-point readable font, standard margins.

* Use English (Arabic terms/headings allowed if required by template).

* References prefer to be from Saudi Arabia related researches.