2012 ~ physics

Saturday, May 19, 2012

DYNAMICS

2:02 AM 1 comment

INTRODUCTION In chapter 3, we discussed kinematics of moving bodies. In this chapter we will deal with dynamics of the bodies. Dynamics tells us answer to such question as: why do bodies move from rest and why do they accelerate or re accelerate? For such motion push or pull types external agency is required, which acts on a body in the motion either brings to the rest or external agency is required, which when acts on a body in a motion either...

Messi Top 10 Goals

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Cristiano Ronaldo 2012 All Season Skills HD

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ELASTICITY

12:18 PM No comments

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VAN DE GAFF GENERATOR

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CONDUCTOR AND INSULATOR

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MEASUREMENT OF CHARGE

4:15 AM No comments

We can measure electric charge on a charged body with the help of a simple apparatus called electroscope. There are two types of electroscope and they can be used to measure charges and find their nature. (a) PITH- BALL ELECTROSCOPE(b) GOLD LEAF ELECTROSCOPE (a) PITH- BALL...

CHARGE RESIDE ON THE SURFACE OF

4:10 AM No comments

On a charged insulator the charges are localized at places where they are supplied. But, in case of a conductor the charges given to any point immediately spread themselves over the surface. Extra charges do not reside inside the volume of a conductor. Three famous experiments show this. (i) BIOT’S EXPERIMENTS Take...

INSULATOR

4:05 AM No comments

It is the clear that the inducing charge of the body (rod) produces opposite type of induced charges. It should be noticed that the inducing charge on the glass rod does not change. We can charge many conductors by the same rod i.e. we can obtain limitless supply of electrical charge this way. By connecting positively charged and negatively charged bodies to a bulb we can desire electrical energy. Does this violate the principal of conservation...

CHARGING A CON DUCTOR BY INDUCTION

3:51 AM No comments

Take a metal rod (A. conductor) AB mounted on an insulating stand as shown in figure 32.3. Bring a positively charged rod towards one end, say A, of the conductor without touching it (fig 32.3(a)). The end A will develop negative charge and the end B will develop positive charge due to the electrostatic induction. The reason that is the free electrons in the conductor will be attracted towards the end A by positively charged rod and...

TESTING THE CHARGES

3:45 AM No comments

Bring a body under test near the disc of an uncharged electroscope. If the leaves remain parallel the body is neutral. The leaves will be diverge if the body has got charge on it. This shows the presence of charges on the body. To examine the nature of charge, we have to put a known type of charges on the electroscope. It can be done by conduction or by induction. To charge by conduction, the disk is touched by hand so that the leaves collapse...

PROPERTIES OF ELECTRIC CHARGE

3:32 AM No comments

Let us look at the properties was the of electrical charges. i) The “positive” and “negative” adjectives added to the charges are not just for convenience. In fact, the positive and negative are to be treated algebraically, so that net amount of charge produced in any process is zero. This is summarized as law of conversation of charges produced in a...

ELECTRIC CHARGE OF ITS NATURE

3:23 AM 1 comment

It is a common experience that a comb, after running through dry hair a few times, can attracts small dust particles or small pieces of paper. Similarly if we rub our hands on silk vest it would also attract small pieces of paper of dust particles, feather etc. When we take off acrylic sweater in a dark room we can see the sparks flying. All these observation demonstrate charging of friction. To study the nature of charge closely let us take a glass...

ELECTIC CHARGE OF ITS NATURE

3:15 AM No comments

INTRODUCTION Today, the word electricity is very mush familier to all of us and everybody knows about it use of electrical appliances like motors, fans, heater, radio, television etc. These function on aspects of electricity and magnetism. In this chapter we will study the nature of electrical charges. Historically study of electricity goes back to 6’th century B.C. Thales, a famous Greek philosopher, was first to notice the attraction caused...

POSITIVE AND NEGATIVE CHARGE CARRIES

2:38 AM No comments

Every matter is composed of a large number of small particles (Atomic hypothesis). It is easy to Think that if two charged bodies attract or repel one another, it is due to attraction or repulsion between the constituent particles. This leads us to think that the constituent particles must also be of two types- positively charged particles and negatively charged particles. Since matter is normally electrically neutral, the number of negatively...

THERMISTOR

1:35 AM No comments

Thermionic is a heat sensitive resistor usually made from semiconductor. It is a non-ohmic conductor and possesses higher –ve temperature coefficient for resistible (ρ). As the resistible increases (decreases) then corresponding resistance will increase (decrease). Here, due to –ve resistance resulting increase of current in the circuit. This determines the temperature of the hot body. Thermistors with high negative temperature...

THERMO- COUPLE

12:20 AM No comments

When two wires of different metals are joined to make a loop and the junction are kept at different temperatures, a potential difference develops between them. As a result a current flows through wires. This potential difference is measured and used to find temperature difference between the junctions. Thermometer based on this principal are called thermo-electric thermometer or thermo-couples. The junction when maintained at constant temperature...

TEMPERATURE SCALE

10:18 PM No comments

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