The Source of Magnetic Fields A magnetic field can be created by running electricity through a wire. All magnetic fields are created by moving charged particles. Even the magnet on your fridge is magnetic because it contains electrons that are constantly moving around inside. The first indication ...
All magnetic fields are created by moving charged particles. Stationary charged particles do not generate magnetic fields. An electromagnet is a magnet that relies on an electric current to produce the magnetic field. The simplest electromagnet is simply a wire carrying a current, which generates a...
A. It has no relation to the Earth's interior structure. B. It can only tell us about the surface temperature. C. Changes in the magnetic field can indicate the movement of materials in the core. D. It can directly show the thickness of the mantle. 相关知识点: 试题...
The magnetic moment is a vector— it has a magnitude and a direction. It's related to both the magnetic field strength and the torque that the field exerts. A whole magnet's magnetic moments come from the moments of all of its atoms. In metals like iron, the orbital magnetic moment ...
这种强磁场 That strong magnetic field 会将自己包裹在黑洞周围 can wrap itself around the black hole, 吸积盘中的任何带电粒子 and any charged particles in the accretion disk 都会沿着这些磁场的路径运动 will follow the paths of those magnetic fields. 有磁场的物体 And where there is a body with ...
Like all magnets, the magnetic field of an activated solenoid has positive and negative poles that will attract or repel material sensitive to magnets. In a solenoid, the electromagnetic field causes the piston to either move backward or forward, which is how motion is created by a solenoid coi...
When a conductor is placed in a changing magnetic field, the electrons in the conductor move, generating an electric current. Magnets produce such magnetic fields and can be used in various configurations to generate electricity. Depending on the kind of magnet used, a rotating electric generator ...
Whenever electricity flows through a wire, it creates a magnetic field. In a single wire, this field is usually pretty weak. A coil, however concentrates the magnetic field. Each coil of wire contributes a small magnetic field and, together, they add up to make a much more powerful magnet...
change cell machinery—has never been carefully examined. Special interest exists in the case when the applied magnetic field dramatically changes in value and direction across the cell body. Here, the important question is: how will the cell respond and adapt itself to a high magnetic field ...
When the coil is energized, the induced magnetic field moves the armature that opens or closes the contacts. See Figure 1. Figure 1: Electromechanical relay: Current through the coil creates a magnetic field that moves the armature between the contacts Electromechanical relays support a wide range...