The presence of the positive charge induces a mass migration of electrons from sphere B towards (and into) sphere A. This movement is induced by the simple principle that opposites attract. Negatively charged electrons throughout the two-sphere system are attracted to the positively charged balloon. This movement of electrons from sphere B to sphere A leaves sphere B with an overall positive charge and sphere A with an overall negative charge. The two-sphere system has been polarized.
When there’s no magnet around, ferrofluid acts like a liquid. The magnetite particles move freely in the fluid. But when there’s a magnet nearby, the particles are temporarily magnetized. They form structures within the fluid, causing the ferrofluid to act more like a solid. When the magnet is removed, the particles are demagnetized and ferrofluid acts like a liquid again.
Static electricity is produced from a process known as triboelectrification. To show how much static electricity an object has, it is determined by its position on the triboelectric series. Its position on this scale is determined by how tight the atom is holding the electrons. An atom is more positive in the triboelectric series if a material is more apt to give up electrons when in contact with another material. If a material is more apt to "capture" electrons when in contact with another material, it is more
An optimised imaging modality would result from a combination of these properties. One such emerging technique that achieves this is Cherenkov Luminescence Imaging (CLI). CLI harnesses Cherenkov radiation to image radionuclides using OI instruments2. Cherenkov radiation is a well known phenomenon that arises when charged particles, such as β- or β+ travel through an optically transparent material with a velocity that exceeds the speed of light in the material. As the particle travels through the medium it loses kinetic energy by polarizing the electrons of the given material.
During the process of TIG welding, an arc is formed between a pointed tungsten electrode and the area to be welded. As a result of the gas shield, a clean weld is formed. This prevents oxidization from occurring. The arc is started with a tungsten electrode shielded by inert gas and filler rod is fed into the weld puddle separately. A slower process than MIG, it produces a more precise weld and can be used at lower amperages for thinner metal and can be used on exotic metals.
In this sort of example you should choose one direction to be positive and the other direction to be negative. The example below illustrates this point. I will choose the right to be positive and the left to be negative. Before being fired After being fired -pcannon +pball p=0 pball - pcannon = 0 Sample Question 8 Sample Question 9 Static electricity In static electricity when two objects are rubbed together the electrons move from one object to another. This causes one object to have an overall positive charge and the other object to have an overall negative charge.
Investigating the various phenomena which occur when monochromatic light undergoes diffraction Title: Determine the wavelength of a monochromatic light source (laser). Measure the groove spacing of a CD and the diameter of powder spores using diffractive methods. Aim: The aims of this experiment are to determine the wavelength of the monochromatic light source and to determine the groove spacing of a CD and the diameter of the Lycopodium powder. Introduction: There are three parts to this experiment in the first part a diffraction grating is used to diffract light from a laser (monochromatic source of light). By measuring the angles of diffraction and by calculating the grating spacing, the wavelength of the light may be calculated.
Visible light rays and x-rays work in a similar manner, both being wavelike forms of electromagnetic energy carried by particles called photons. “The photon concept was introduced by Albert Einstein in order to explain physical phenomena that could not be understood based on the wave properties of light” (Bensaada, Ouellette, 2011, pg 32). The only difference between both is the energy levels of these photons, which is expressed as the wavelength of the rays. Visible light rays and X-Rays are produced by the movement of the electrons in the atom. Another form of more sophisticated X-rays are CT Scans, computer tomography also known as Cat Scans.
When we use some electric appliances, the electromagnetic waves of these appliances will change periodically and produce enough energy to cause ionization. As we all known, ionization can dislodge orbiting electrons from atoms or break bonds which hold molecules together and then producing ions or charged particles. During this process, the production of ions or ionization in our tissues may cause direct damage to cells and cause other health risks. So EMF radiation is also called ionizing radiation. (DCMNR, 2005) This conception maybe a little bit confusing, but it’s easy to find out that EMF really produces some extra electrons or magnetic field which we have never seen before.
Objective: To understand the effect of voltage on photocurrent for a given intensity of light; and to understand the effect of varying frequencies of light on the cutoff voltage for photoelectric effect. Analysis: For the first part of the experiment, a light source was shown onto the phototube with a constant intensity. In the phototube was there was and anode and cathode in which a voltage was applied across. The voltage across the plates served to attract the electrons, if the voltage was positive, or repel them, if it was negative. A positive voltage increased photocurrent while a negative voltage decreased photocurrent.