Book Shelf

  It is a widely acclaimed book by Benjamin Graham on value investing. Written by one of the greatest investment advisers of the twentieth century, the book aims at preventing potential investors from substantial errors and also teaches them strategies to achieve long-term investment goals. Over the years, the investment market has been following the teachings and strategies of Graham for growth and development. In the book, Graham has explained various principles and strategies for investing safely and successfully without taking bigger risks. Modern-day investors still continue to use his proven and well-executed techniques for value investment. The current edition highlights some of the important concepts that are useful for the latest financial orders and plans. Keeping Graham's unique text in original form, the book focuses on major principles that can be applied in day-to-day life. All the concepts and principles are explained with the help of examples for better clarity and ...

 When a small positive test charge is placed in the electric field due to another charge, it experiences a force. So, work has to be done on the positive test charge to move it against this force of repulsion. The electric potential (or potential) at a point in an electric field is defined as the work done in moving a unit positive charge from infinity to that point. Potential is denoted by the symbol V and its unit is volt. A potential of 1 volt at a point means that 1 joule of work is done in moving 1 unit positive charge from infinity to that point. Since the unit of charge is the coulomb, so we can also say that: A potential of 1 volt at a point means that 1 joule of work is done in moving 1 coulomb of positive charge from infinity to that point. A more common term used in electricity is, however, a potential difference which we will discuss now. Previous Topic -   Conductors and Insulators Next Topic -  Potential Difference

In some substances, the electric charges can flow easily while in others they cannot. So, all the substances can be divided mainly into two electrical categories: conductors and insulators. Those substances through which electric charges can flow are called conductors. But the flow of electric charges is called electricity, so we can also say that: Those substances through which electricity can flow are called conductors. All the metals like silver, copper and aluminium, etc., are conductors (see Figure 1).  Figure 1. Conductors and insulators. The metal alloys such as nichrome, manganin and constantan (which are used for making heating elements of electrical appliances) are also conductors but their electrical conductivity is much less than that of pure metals. Carbon, in the form of graphite, is also a conductor. The human body is a fairly good conductor. Those substances through which electric charges cannot flow are called insulators. In other words : Those substances through ...

It has been found by experiments that there are two types of electric charges: positive charges and negative charges. By convention, the charge acquired by a glass rod (rubbed with a silk cloth) is called positive charge, and the charge acquired by an ebonite rod (rubbed with a woolen cloth) is called negative charge. An important property of electric charges is that : (i) Opposite charges (or Unlike charges) attract each other. For example, a positive charge attracts a negative charge.  (ii) Similar charges (or Like charges) repel each other. For example, a positive charge repels a positive charge; and a negative charge repels a negative charge. The SI unit of electric charge is coulomb which is denoted by the letter C. We can define this unit of charge as follows: One coulomb is that quantity of electric charge which exerts a force of 9 ×  10 9  newtons on an equal charge placed at a distance of 1 meter from it. We now know that all the matter contains positively char...

E lectricity is an important source of energy in modern times. Electricity is used in our homes, in industry, and in transport. For example, electricity is used in our homes for lighting, operating fans, and heating purposes. In industry, electricity is used to run various types of machines, and in the transport sector electricity is being used to pull electric trains. In this chapter, we will discuss electric potential, electric current, electric power and the heating effect of electric current. In order to understand electricity, we should first know something about the electric charges. These are discussed below. Can you imagine life without electricity? What would this city look like at night if there was no electricity? If we bring a plastic comb near some very tiny pieces of paper, it will not have any effect on them. If, however, the comb is first rubbed with dry hair and then brought near the tiny pieces of paper, we find that the comb now attracts the pieces of paper towards i...

  नेटवर्क मार्केटिंग कितना सच कितना झूठ : Networking Marketing Kitna Sach Kitna Jhuth PDF Download Free Author  Dr. Ujjwal Patni Publisher Description आप इस क्षेत्र में पुराने हैं, आप ज्ञानी हैं, आपको नेटवर्क मार्केटिंग के बारे में सब कुछ मालूम है, आपको सारे कम्पेन्सेशन प्लान की जानकारी है, आपको सारी नेटवर्क कंपनियों की जानकारी है, आपने सारे श्रेष्ठ लेखकों की किताबें पढ़ी हैं, आपने एक से बढ़कर एक टेप सुने है और वीडियो देखे हैं, आप नेटवर्क मार्केटिंग पर शास्त्र लिखने की योग्यता रखते हैं। ‘‘लेकिन क्या आप डायमण्ड हैं’’ मित्रों, मेरे पास इतना वक्त नहीं है कि मैं आपकी गहराई नापूं, आपकी विद्वता की ऊँचाई देखूं, मेरा तो सिर्फ एक सीधा और तीखा सवाल है। ‘‘जब आप इतने अनुभवी हैं, ज्ञाता हैं, विद्वान हैं, पुराने हैं तो आखिर डायमण्ड क्यों नहीं हैं’’, इसका अर्थ यह है कि इन सब के बावजूद कोई तत्व है जिसकी आपके अंदर कमी है। मैं सिर्फ एक बात जानता हूं कि ‘‘आप कितना जानते हैं, वह उतना महत्त्वपूर्ण नहीं है, महत्त्वपूर्ण यह है कि आप कितना करते हैं’’। हो सकता है कि आप 100 सूत्र जानते हैं लेकिन सिर्फ ...