The French physicist Andre-Marie Ampere (1775-1836) discovered that an electrical current (moving charges) produces a magnetic field. If C is a closed curve that encloses a current I, then Ampere's Law states that B middot dr = mu0 I, where mu0 is the magnetic permeability of the ...
Once a head arrives at a certain location on a platter, an electromagnet produces a magnetic field, which aligns data-carrying domains in the underlying track. Each domain can be aligned in one of two possible directions — 1 or 0. As these alignments change, they form patterns that ...
It's thought that such a powerful magnetic field might turn a photon into an axion, thus revealing the hypothetical particle to be real. Researchers are trying to tackle dark matter from all sides to uncover whatever information they can. But why is dark matter so important? If it's so ...
Now, let the input voltage E, is applied across the brushes.Electric currentwhich flows through the rotor armature via brushes, in presence of themagnetic field, produces a torque Tg. Due to this torque Tgthe dc motor armature rotates. As the armature conductors are carrying currents and the ...
Now, if a mechanical pump produces a pressure difference between two points, then pressurized water will be able to do work, such as driving a turbine. Similarly, in an electric circuit, the potential difference of a battery can cause current to flow through the conductor hence, work can be...
Beijing has placed strict restriction on the number of newly purchased car in the city and the policy bas sparked heated discussion. Some people support the policy, saying it,s a powerful method to cope with the severe traffic congestion in the capital. With cars increasing drastically in the ...