Ask Physics

Can the frictional electricity produced during landing of a plane be used for constructive purposes?

As we know that in aeroplane during landing the charged produced in it due to the friction with ground are earthed through its wheels; can this charge be stored with the help of a capacitor and used for useful purpose?

Answer:

I feel that this is a metter for research.

If you feel otherwise and know some method to tap this potential, please post.

What is Higgs Boson?

Why do we need Higg’s Boson? Helen Heath explains why the Standard Model needs the Higgs boson.

http://physicsworld.com/cws/article/multimedia/50419

Gordon Fraser and Michael Riordan argue that the boson discovered at CERN should be known not as the Higgs boson, but the “higgson”
Read more at http://physicsworld.com/cws/article/print/2012/jul/04/introducing-the-higgson

Related articles

• How does Higg’s Boson transfer mass?

A few questions to students

Many teachers often say that, when students get good marks they claim to be because of their own effort and when they fail or get very less marks, they blame it own the teachers.

I want to ask this questions to students in open. Any student can join the discussion. Whatever you post, let it be your own genuine answer.

Here are the question for students.

If you get good marks in Physics, is it because of your teacher or because of your own effort?

If you don’t  get good marks in Physics, is it because of your teacher or because of your own lack of practice?

Teachers are also welcomed to post their response.

Related articles

• Best Movies About Great Teachers Who Inspire Their Students(maryareed.wordpress.com)

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• Education of the Future – Role of Teacher and Technology (4b2012.wordpress.com)

Calculating charge on a body with excess of electrons

How would I calculate the charge on a small sphere with an excess of 5.0 x 10 ¹⁴ electrons?

Asked Kaitlin Thomas

Answer:

We know that charge on an electron is (-) 1.6 x 10^-19 C

If the sphere has 5.0 x 10 ¹⁴ electrons in excess then the body has a net negative charge and is given by q = ne

Charge on the sphere = 5.0 x 10 ¹⁴ x (-) 1.6 x 10 ^-19 = 8 x 10 ^-5 C

How was your Physics Practical Examination?

Hello students!

It’s the time of AISSCE Practical Examination.

How was your Physics Practical Examination and Viva?

Which questions were asked to you?

Which were the experiments and activities you were asked to perform?

How farely did you do it?

Share your experience here as comments to this post. Your responses will be a boon for the others.

You can post the questions you were asked during Viva so that others can find the answers to them and learn for the Viva during their turn.

Random collection of Physics Viva Questions

1. State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned)
2. How can we increase the sensitivity of a potentiometer?
3. Define figure of merit of a galvanometer.
4. Which has more resistance – a galvanometer or a milliammeter?
5. How does an LED emit light?
6. What is the difference between an ordinary diode and an LED?
7. Define principal axis of a convex lens?
8. What happens to the focal length of a concave mirror if it is immersed in water?
9. What are the factors affecting the internal resistance of a cell?
10. What are the difference between primary and secondary cell?
11. Why can’t we use a dry cell for starting a car?
12. What happens to the resistivity of a wire when it is doublefolded?
13. How does the resistance of a wire depend on its dimensions?
14. Why are the resistances used in a resistance box is like 1,2,2,5,10,20,20,50,100,200,200,500,1000,2000,2000,5000 etc?
15. Why constantan or manganin wires are used for making the resistance coils in resistance box?
16. What is a standard resistance?
17. What are the characteristics of a standard resistance?
18. What are the precautions to be observed while doing electricity experiments in general?
19. What is a galvanometer?
20. What is the resistance of an ideal ammeter?
21. Why is ammeter always connected in series and voltmeter always connected in parallel?
22. How can we convert a galvanometer into an ammeter or a voltmeter?
23. What is shunt?
24. What is AVO meter?
25. What is the effect of temperature on the resistance of a conductor?
26. Why does the resistance of a conductor increases with temperature, whereas that of a semiconductor decreases with temperature.
27. What is conductance?
28. What are non ohmic devices? give an example.
29. What are superconductors?
30. Define emf
31. Why emf is said to be a misnomer?
32. What happens if the battery used in the primary circuit of a potentiometer has less emf compared to the emf of the cell used in the secondary circuit?
33. If you find that the galvanometer reading is shaky, what error can you expect?
34. What do you mean by figure of merit of a galvanometer?
35. Why a moving coil galvanometer is called so?
36. What is the principle of a galvanometer?

Horizontal projectile and freely falling body

A rifle at a height H aimed horizontally fires a bullet to the ground. At the same time , a bullet with the same mass in dropped from the same height. Neglecting air resistance, which one hits the ground first?Explain. ED posted Answer: Both will hit t...

Read more...