steady current and its topics

• Flow of charge of current per unit time is called current
• Convenction current direction is always opposite to the direction of flow of electrons
• Current density is defined as the ratio of the current to the cross section area
• When the electric field is established between the two ends of the conductor, the free electrons experience a force. The motion of the electrons get accelerated, but the speed of the electrons does not increase continuously. The electrons in the conductor collide and collide again with positive ions of the conductor such that they lose the energy which appear in the form of heat. Altogether this field does not give any acceleration to the motion of the electrons such that constant velocity of electrons is maintained. That constant velocity is called drift velocity.

Problems on coulomb's law

This video indicates  two problems on coloumb's law

effect of dielectric on energy stored in a capacitor and its explanation

This video indicates the effect of dielectric on energy stored in a capacitor when the circuit connected to charging battery and when the circuit is disconnected from the charging battery

Energy stored in a capacitor and its explanation

This video explains about the energy stored in a capacitor.

Combination of capacitors and its explanation

This video has explanation about series and parallel combination of capacitors

Dielectric materials and its explanation

This video explains about non-polar dielectric materials and polar dielectric materials and the effect of dielectric on the capacitor

Funny Fysics...hehehe...

Dielectrics and its explanation

This video is taken from windows movie maker through www.youtube.com

Capacitor and its explanation

This video is taken with the help of windows movie maker through www.youtube.com

The relation between the electric field and potential difference

This video is taken from windows movie maker with aid of www.youtube.com

Electric potential at a point due to point charge

This video is taken with help of windows movie maker  and with aid of  www.youtube.com

electric field at a point on the perpendicular bisector of an electric dipole

This video is taken with help of windows movie maker and with aid of www.youtube.com

Electric field due to an electric dipole

The electric dipole is made up of two equal and opposite charges +q and -q coulomb seperated by a distance 2l metre as shown in the below figure
In order to calculate the electric field at a point P distance r from the centre O of the dipole. Let  E1 and E2 be the intensities of electric field at P due to +q and -q respectively, So

Then the resultant intensity at point P will be different of the two intensities because they are along the same line but in opposite directions. Thus

E=E1-E2(Since E1>E2 in direction of AP)

Motion of the centre of mass of earth-moon system

The moon moves around the sun in circular orbit and the earth moves around the sun in an elliptical orbit. Comparing of mass of earth is far greater than the mass of the moon such that the gravitational force between the earth and the moon treated as internal forces for the earth-moon system. But earth-sun system, it is quite opposite and the gravitational force between the sun and the earth-moon system is treated as external force such that the motion of the centre of mass of the earth-moon system is in elliptical path around the sun. Suppose a stationary body explodes in different fragments with velocities v1 and v2 in different directions, then
(v1/v2)=(m2/m1)

Explosion-centre of mass

Imagine a shell is fired making certain angle with horizontal direction. It is under the influence of gravitational force and allows the parabolic path. Let the shell explodes into fragments due to internal forces in its path. It will be found that different fragments will fly in different directions. But only one point in the system does not disturb its path, i.e., it follows in parabolic path. In the process of explosion, some changes may occur in momentum of individual fragments due to internal forces, but the centre of mass has its motion unaltered. From this once again it can be proved that centre of mass  solely depends on external force, but gravitational force is applied on the shell from the beginning which continues the motion of the shell in parabolic patThis figure shows the path of the shell under explosion as a parabolic path.

Intensity of electric field due to a point charge

This video gives the explanation about intensity of electric field due to point charge and it was taken with aid of windows movie maker and www.youtube.com

Electric lines of force and its explanation

This video tells about the concept of electric lines for force. This video is made using windows movie maker from where it is uploaded to www.youtube.com from which it is taken to www.narasimhakanduri.blogspot.com

Coloumb's law and its explanation

This video gives fundamental knowledge about the force between charges and this video is taken by using windows movie maker  and uploaded to www.youtube.com

Electrostatics and its brief introduction

This video is recorded using web cam and microphone through the aid of windows movie maker via www.youtube.com

Electrostatics-video

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This video indicates some slide show of electrostatics topics which are taken via www.youtube.com with aid of windows movie maker.

centre of gravity and its applications

centre of gravity concept is widely applicable in day to day life. We often listen mostly lorry accidents occured. Can you imagine why that is happened? because centre of gravity is greater height comparing with other vehicles. Even centre of gravity is applicable for us also, how? if we stand on the floor because of our centre of gravity is stable and in balancing position. The roads at turnings are constructed with making some angle by one side of the road with the earth to overcome the accidents made by vehicles. Due to this reason, vehicles maintain centre of gravity  balanced. When the man is walking on a rope holding a pole in his hand is possible by balancing his centre of gravity is stable.