9i + 9g in action

Keliatannya anak2 mulai jenuh dengan praktikum fisika dari yang itu ke yang itu lagi. Sekali2 anak2 greeone, boleh dong praktek sambil bikin ekspresi yang rada beda dari keseharian. Bolehlah.. ngga ada yang ngelarang. Coba klik judulnya.






Medan magnetik beda banget dalam aspek penting yang lain. Normalnya sich, kalo ada medan statis yang diada2 kan, energi bisa aja dimasukkan ke dalam medan tsb dan diambil paksa dari medan itu. Suatu massa yang dijebloskan ke dalam medan gravitasi akan berupa atau memiliki energi potensial; sedangkan muatan positif yang bergerak dibawah pengaruh medan listrik akan mendapat energi kinetik. Keadaan begini nich..ngga akan kejadian di medan magnet. Gimana sich cara ngitung gaya magnet ini ? atau..gimana matematiknya gitu..? Coba baca penjelasan ini.




The precise formulation of the Lorentz force is by the vector equation
F = qv X B
What this means is that the force, the velocity and the field have a direction as well as a magnitude, but more importantly it signifies that it is only the components of v and B which are at right angles to each other that contribute towards the magnitude of the force. Further, the direction of this force is perpendicular to the plane defined by the direction of v and B.

Because the charge q can be either positive or negative the direction of force is opposite in each case.

The magnitude of the Lorentz force is

F = qvB sin A

where A is the angle between the direction of the velocity of the charge and the direction of the magnetic field.
For simplicity at this stage we are only going to consider the electron as our moving charge.


Sumber : XMM



Scientists remove lead from blood

South Korean scientists have found a new method to remove dangerous heavy metals such as lead from blood using magnetic receptors.

According to an article published in Angewandte Chemie International Edition, Gyeongsang National University researchers could remove 96 percent of lead ions from blood samples along with their lead cargo.

"Detoxification could theoretically work like hemodialysis: the blood is diverted out of the body and into a special chamber containing the biocompatible magnetic particles," the scientists wrote.

"By using magnetic fields, the charged magnetic particles could be fished out. The purified blood is then reintroduced to the patient."

Lead intoxication is often the result of occupational hazards and targets children in most cases. Large amounts of lead in children may cause anemia, muscle weakness and brain damage.

Lead poisoning is usually gradual, with small amounts of the metal accumulating over a long period of time, Reuters reported.( Press TV)