Force between current flowing parallel wires
When TWO conductors are carrying current in the same direction, there is a force of attraction between them.
this is because, the current in the first conductor produces a magnetic field in the
region on the second conductor. The second conductor which itself carry a current, will experience a force ( Magnetic Lorentz force ). The direction on this force will be towards the first conductor ( Fleming left hand rule )
Duration: 25 Seconds
Author: http://www.youtube.com/user/OlsenEngrUToob
Friday, July 16, 2010
Saturday, July 10, 2010
Magnetic field in side a Toroid
Toroid has less chance of magnetic flux leakage , because it is an end-less solenoid.
The magnetic field remain confined within the toroid. They are used in radio circuits,
C.F.L lamp circuits, as they can easy handle high frequency
In this video Red moving spots represents electrons (opposite to current direction)
and Green direction of magnetic field in side the toroid.
Video time : 8 seconds
The magnetic field remain confined within the toroid. They are used in radio circuits,
C.F.L lamp circuits, as they can easy handle high frequency
In this video Red moving spots represents electrons (opposite to current direction)
and Green direction of magnetic field in side the toroid.
Video time : 8 seconds
Cyclotron
Cyclotron
It is a particle accelerator first made by Ernest Lawrence in 1932
The circular motion of a charged particle perpendicular to a uniform magnetic field is used in accelerating ions to high energies. The charged particles are accelerated in steps by subjecting it to perpendicular magnetic field and alternating electric field.
It consists of a pair of hollow, metallic, semi circular cylindrical chambers called dees.
Dees are arranged in a evacuated chamber, seperated slightly along their diameters. The source ions is placed at the center of the gap between the poles of a strong electromagnet which provide large magnetic field perpendicular to the plane of the dees. The dees are connected to the terminals of a High Frequency Oscillator.
Video time: 2:17 Min
History of particle accelerators begin win Ernest Lawrence
It is a particle accelerator first made by Ernest Lawrence in 1932
The circular motion of a charged particle perpendicular to a uniform magnetic field is used in accelerating ions to high energies. The charged particles are accelerated in steps by subjecting it to perpendicular magnetic field and alternating electric field.
It consists of a pair of hollow, metallic, semi circular cylindrical chambers called dees.
Dees are arranged in a evacuated chamber, seperated slightly along their diameters. The source ions is placed at the center of the gap between the poles of a strong electromagnet which provide large magnetic field perpendicular to the plane of the dees. The dees are connected to the terminals of a High Frequency Oscillator.
Video time: 2:17 Min
History of particle accelerators begin win Ernest Lawrence
Leaf Electroscope: School Project
Leaf Electroscope:
Electroscope is a device to detect the pretense of charge on a body. It also give an
indication of the amount of static charge on the body.
Leaf electroscope is a simple equipment to detect the static charge presence. it has
a metal bob/metal rod to collect the charge. The other end of the rod carries two
thin aluminum foil, laid hanging from a single end.
When a charged balloon (charged by friction on hair) is brought near to the metal rod
,by induction opposite charges are induced on the rod and same changes are replied
to the other end of the rod (that is, the aluminum foils. Two foils get similar charges are repelled mechanically, showing out a visual separation.
Demonstration of static electricity generated when a plastic bag is rubbed on hair / woolen clothing. Aluminum foil get seperated
Video time: 0:52 Min
Materials used: Jam jar, screw, paper clip, household cooking foil.
The electroscope worked better after the jar was dried in a warm oven. this will avoid leaking out of static charge
More video from http://www.youtube.com/user/uGordy7
A PVC tube is charged by friction with a soft cloth, the aluminum foil electroscope is used to detect the static electricity charge.
Video time: 0:16 min
More from http://www.youtube.com/user/zakasilva
Electroscope is a device to detect the pretense of charge on a body. It also give an
indication of the amount of static charge on the body.
Leaf electroscope is a simple equipment to detect the static charge presence. it has
a metal bob/metal rod to collect the charge. The other end of the rod carries two
thin aluminum foil, laid hanging from a single end.
When a charged balloon (charged by friction on hair) is brought near to the metal rod
,by induction opposite charges are induced on the rod and same changes are replied
to the other end of the rod (that is, the aluminum foils. Two foils get similar charges are repelled mechanically, showing out a visual separation.
- Suggested for students view
Demonstration of static electricity generated when a plastic bag is rubbed on hair / woolen clothing. Aluminum foil get seperated
Video time: 0:52 Min
Materials used: Jam jar, screw, paper clip, household cooking foil.
The electroscope worked better after the jar was dried in a warm oven. this will avoid leaking out of static charge
More video from http://www.youtube.com/user/uGordy7
- Suggested for students view
A PVC tube is charged by friction with a soft cloth, the aluminum foil electroscope is used to detect the static electricity charge.
Video time: 0:16 min
More from http://www.youtube.com/user/zakasilva
Van de graff generator : Describing parts
Van de graff generator is an electrostatic generator first designed in 1931. it is capable of producing potential difference of about 6 to 10 million volts. Such a high voltage is made use of to accelerate charged particles to carry out nuclear reactions.
Principle
If a charged coductor is brought into internal contact with a hollow counductor, all of its charge gets transferred to the hollow conductor, irrespective of its own potential
Construction
It consists of a spherical metal shell mounted on an insulating stand ( glass, plastic ) above the ground.
A long narrow belt of an insulating material like rubber (or silk ) is wound around two pulleys p1 and p2.
Pulley p1 is at the center of the spherical shell and p2 is at the ground level. The belt is made to rotate with the help of a motor.
Working
Positive charges are sprayed to the belt by a brush b2 near the bottom. This brush made of copper collects electrons from the rubber while it is rubbed. (copper being more electro negative than rubber), thus leaving out positive charges on the belt. b2 is earthed using a wire. The electrons thus collected in the brush b2, flows to ground.
The positive charges are carried up along the rubber belt. The collecting brush b1 on top transferes these charges
from the belt to the inner portion of the spherical shell. The charges are "Switched" to the outer sufrace of the shell instantily.
As the belt continues to rotate, more and more positive charges gets collected on the shell, which rises its potential to a high value.
Video by http://www.youtube.com/user/CarletonPhysics
Physics lab demo 3
Principle
If a charged coductor is brought into internal contact with a hollow counductor, all of its charge gets transferred to the hollow conductor, irrespective of its own potential
Construction
It consists of a spherical metal shell mounted on an insulating stand ( glass, plastic ) above the ground.
A long narrow belt of an insulating material like rubber (or silk ) is wound around two pulleys p1 and p2.
Pulley p1 is at the center of the spherical shell and p2 is at the ground level. The belt is made to rotate with the help of a motor.
Working
Positive charges are sprayed to the belt by a brush b2 near the bottom. This brush made of copper collects electrons from the rubber while it is rubbed. (copper being more electro negative than rubber), thus leaving out positive charges on the belt. b2 is earthed using a wire. The electrons thus collected in the brush b2, flows to ground.
The positive charges are carried up along the rubber belt. The collecting brush b1 on top transferes these charges
from the belt to the inner portion of the spherical shell. The charges are "Switched" to the outer sufrace of the shell instantily.
As the belt continues to rotate, more and more positive charges gets collected on the shell, which rises its potential to a high value.
Video by http://www.youtube.com/user/CarletonPhysics
Physics lab demo 3
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