Magnetic field of earth intensity,fema preparing for disaster in region 3 2014,bangladesh disaster preparedness center (bdpc),top american movie actors - Easy Way

Derive an expression for gravitational field strength at the surface of a planet, assuming that all its mass is concentrated at its centre. The force between the positive charge of protons and negative charge of electrons is called electric force. Why don't the oppositely charged protons in the nucleus or electrons surrounding them repel each other and fly apart.
There is one underlying principle there that you have met before in a slightly different context.
Draw a diagram to show why someones weight on top of Everest is significantly less than at the surface of the Earth. A physical field is an area in which a force occurs, a gravitational field is therefore a region of space in which an object with mass experiences a gravitational force. When we represent fields, we draw field lines to show the direction of the force acting on a test object. Any two point masses are attracted to each other with a force that is proportional to each of their masses and inversely proportional to the square of the distance between them.
Point masses means that we forget about an object having a size, and consider only its mass acting at a single point (we have come across this idea before, when we considered centre of mass). The inverse square law - this occurs quite a lot physics and is worth going into in more detail. Thus Newton's law of gravitation implies that the gravitational force falls off according to the inverse square law.
Then we introduce the constant of proportionality, the universal gravitational constant, G. If the mass of the earth is 6.0x1024kg and its radius is 6400km work out the gravitational force on a 1kg mass on its surface. Gravitational field strength at a point in a gravitational field is the force exerted on a unit mass at that point. Read the details of Cavendish's experiment to weigh the Earth, and then complete the worksheet.

An electric field is a region of space in which an object with charge experiences an electric force. Observe the electric field pattern set up between two charged parallel plates using the polar particles of semolena.
The force acting between two point charges is directly proportional to each of their charges and inversely proportional to the square of the distance between them.
Given a physical significance it would denote the ease with which electric field permeates through space. Electric field strength at a point in an electric field is the force exerted on a unit charge at that point.
Observe the movement of a test charge movement in different electric fields, with this applet .
Have a go at the simulation of Millikan's Oil Drop experiment to determine the fundamental quantity of charge. Basically all the atoms in the magnet are aligned so the electrons are all orbiting the same way. With this in mind and knowing that the earth is spinning we can determine the earth's magnetic field, and see that it looks very like that of a simple bar magnet. Explain why what we call the north pole of the earth is in fact a magnetic south pole (think about what a navigation compass actually is).What force acts on a current carrying conductor in a magnetic field? This equation work well provided that the direction of the current and that of the magnetic field are perpendicular. We can predict the direction and calculate the force acting on a current carrying conductor placed in a magnetic field. This means with some simple manipulation we should also be able to predict the direction and size of forces acting on moving charges in a magnetic field. An important note: When we were using the Fleming's left hand rule to predict the direction of forces, etc, we were considering conventional current.
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Electrons have a negative charge, protons have a positive charge and neutrons have a neutral charge.
Electric force is much stronger  than the gravitational force, but because most macro sized objects have equal numbers of protons and electrons, we rarely see its effects on a large scale. Atoms are composed of a positively charged nucleus, surrounded by negatively charged electrons. For example for light eminating from a single source in all directions, its intensity is four times less when you are twice as far away from it. Estimate the gravitational force of attraction between two people sitting side by side on a park bench. It is simply a constant of proportionality that allows us to use our conventional units for charge and force.
It can be replaced with er, relative permittivity when the medium separating two charges isn't free space.
Each electron is moving thus you have electricity and because there is electricity there is also magnetism. We must remember that the movement of negative electrical charge is in the opposite direction to conventional current and account for this when we solve problems involving moving charges. Because everything else is made up protons, electrons and neutrons they also have electrical charge. Protons are about 1800 times more massive than electrons, but carry the same amount of charge (only positive). How does this force compare with the gravitational force exerted on them by the Earth, i.e.

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