In the adjacent circuit find, (i) the current in resistor $R$, (ii) the unknown emf $E$, (iii) the resistance $R$, (iv) if the circuit is broken at $P$, what is the current in resistor $R$?

(i) Using Kirchhoff's current law at point $'D'$, 

Current through $R = 6 - 4 = 2\;A$ 

(ii) Applying Kirchhoff's voltage law in close loop ABCDA, 

$E = 3 \; *\; 6 \;+\; 4\; *\; 6 = 18\; + \;24 = 42\; V$ 

(iii) Again, Applying Kirchhoff's voltage law in close loop AFEDA, 

$E - 28 = 6 * 4 - R * 2$ 

$42 - 28 = 24 - 2R$ 

$2R = 24 - 14 = 10$

$R = 5 \; \Omega$

(iv) If the circuit is broken from point $'P'$ then,

Current$(I) = \frac{V}{R\; +\; 3} = \frac{28}{5\; + \;3}$   $ = 3.5\; A$

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Radioactivity | PPT Slide

Be less curious about people and more curious about ideas.

~ Marie Curie

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Nuclear Physics | PPT Slide

All of physics is either impossible or trivial. It is impossible until you understand it, and then it becomes trivial.

~ Ernest Rutherford

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Electricity and Magnetism (Complete Chapter) | Grade 10

“Physics isn't the most important thing. Love is.”

~ Richard P. Feynman

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Electricity and Magnetism (Transformer) | Grade 10

“Electricity is really just organized lightning” 

~ George Carlin

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What is time? - David Albert

Time is nature's way of keeping everything from happening at once. 

~Woody Allen

Time appears in physics is as another component in the address of an event. It's hard to know how to do that people talk about time, flowing a common question that gets asked of such people is how fast is it flowing? The normal answer is: I don't know. [........] The next question is: What would it be like if it were flowing two seconds per second instead of one second per second?

For more information, let's watch the video.

18 Equations that changed the WORLD:

"If you want to learn about nature, to appreciate nature, it is necessary to understand the language that she speaks in."

~ Richard P. Feynman

Mathematics is a language of Nature, which describes the ways of nature. Mathematics is also called a tools for reasoning. It is a language plus reasoning, it is like a language plus logic.

In 2013, mathematician and science author Ian Stewart published a book on 17 Equations That Changed The World.

If you would like to download a poster, Click here.

A Map of Everything know about Physics | Physics

"Don't just see things differently, think things differently. Realize that everything connects to everything else."  

~ NoThingness knows Everything?

Source: Dominic Walliman (youtube)

Everything we know about physics and  a few things we don't in a simple map. Physics is a huge, complex field. It also happens to be one of the most fascinating, dealing with everything from large scale (i.e. Cosmology - black hole, wormhole) to small scale (i.e. Quantum teleportation, Gravitational waves etc.) [1].  Let's enjoy with a video, What's the map of physics is?

 

Click here for the map of Mathematics

The Nobel Prize in Physics 2013:

The Nobel Prize in Physics 2013 was awarded Jointly to François Englert & Peter W. Higgs for the discovery of "Higgs Boson Theory".

 

Photo Source: G. M. Greuel via Wikimedia commons  

François Englert - Nobel Prize Winner: 2013

 

This is a Nobel Lecture by: Francois Englert:

Photo Source: Pnicolet via wikimedia commons

Peter W. Higgs - Nobel Prize Winner: 2013

 

This is a Nobel Lecture by: Peter W. Higgs:

How to Secure Success:

• "The Secret to Creativity is knowing how to hide your sources."

  
  

  You can't tell everyone everything. Somethings you just have to keep secret. If you are doing something that no one else is doing & it is working, then keep your secret. If you want to be creative don't allow your method to be revealed.

  
  
  

  •  "Thinking, Knowing & Understanding about PHYSICS: is the greatest tool to secure of Success."

  

  Thinking about PHYSICS

• If  you want to know the secret of NATURE:

          "Greater understanding of Symbols, Numbers & Sacred Geometry."

• The secret of success is:

              - concentrating interest in life.

              - interest in the small things of NATURE.

 In other words: "To be fully awake to EVERYTHING."

• "The secret of success is concentrating interest in life.............; interest in the small things in nature.

            In other words to be fully awake to Everything."    - spl

• "Look deep into NATURE, and then only you will understand EVERYTHING better." 

                                                                                                                                - Albert  Einstein.

• To archive great things we must:

                   - Not only act but also dream;
                   - Not only plan but also believe.  "Believe in YOURSELF."   - spl

• "Stop building walls around you, Start building bridges." Which is helpful for other! - spl.