Period: Date: Electrostatics: Electric charges and Coulomb’s Law problems I I. Answer the following problems. 1. Calculate the electric force between two point charges of 4.00 µC and 3.00 µC when they are 2.00 cm apart. 2. Two points of equal charge produce an electric force on each other of 3.40x10 -2 N when placed 0.100 m apart. What is the charge on each point? 3. How far apart are two point charges of 2.0x10-6 C and 4.0x10-6 C if they produce an electric force of 0.56 N? 4. Two
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you might be wondering how they are related. It’s not obvious at first but as you go deeper‚ you will realize that these two things are somehow related with each other. In Physics‚ the electric field from a positive charge points away from the charge; the electric field from a negative charge points toward the charge. The opposite happens in Psychology. In the study of Proxemics (personal space)‚ there is a decrease in the personal space requirement if other people find you as a positive person. On
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known to man. Lightning is an electric current; thus within a thundercloud up in the sky‚ many small bits of ice (frozen raindrops) collide into each other as they move around in the air. All of those collisions create an electric charge. After a while‚ the whole cloud fills up with electrical charges. The positive charges form at the top of the cloud and the negative charges form at the bottom of the cloud. Since opposites attract‚ that causes a positive charge to build up on the ground beneath
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calipers for measuring thickness of spacer [鍵入文件的引文或重點的摘要。您可以將文字方塊放在文件中的任何位置。使用 [文字方塊工具] 索引標籤以變更重要引述文字方塊的格式。] III. Theory A capacitor is a device which can store charge. It consists of two sheets of conductor separated by a layer of insulator called dielectric. The capacitance of a capacitor is defined as the charge stored per unit potential difference applied to the capacitor : In the experiment‚ a reed switch allows the capacitor to be charged up and discharged rapidly :
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divided Atoms can be divided into three subatomic particles Protons Neutrons Electrons Subatomic Particles Electrons Discovered by UK physicist J.J. Thomson (1856-1940) Are negatively charged subatomic particles. Thomson’s Experiment passed electric current through gasses at low pressure sealed the gases in glass tubes fitted at both ends with metal disks called electrodes electrodes connected to source of electricity one electrode
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Biochemistry Exam I Terminology Boiling point is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid. At this temperature the liquid phase changes into the gaseous phase (also a colligative property) Melting point is the temperature at which the solid and liquid phases are in equilibrium. At this temperature the solid state changes into a liquid phase (also a colligative property) Specific heat is the amount of energy (in joules or calories) needed
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experiment to do‚ I decided to do an electrostatic experiment using the Franklin bell. I had to try and find different energy sources that would work for me. Any electronic instrument would give off enough electricity‚ but I eventually settled on using a electric bug zapper because it was easy to set up the crocodile clips with it. Afterwards I tried the same experiment with a television set‚ using tinfoil which gave static electricity when it was switched on and off. Investigative question: Will the aluminium
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effects of electrical charges on small-uncharged objects‚ electrical attraction and repulsion‚ creation of electrical charge‚ practical uses of electrical charges‚ and measurement of electrical force between electrical charges. Findings Electric current is the flow of electric charge. Some materials become electrically charged when rubbed together. A substance that gains electrons becomes negatively charged‚ while a substance that loses electrons becomes positively charged. Charges that are the same
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® keep it simple science ABN 54 406 994 557 (02) 6583 4333 PO Box 2575 PORT MACQUARIE NSW 2444 FAX (02) 6583 9467 www.keepitsimplescience.com.au mail@keepitsimplescience.com.au keep it simple science Photocopy Master Sheets Years 7-8 FORCES Disk filename = “02.Forces” Copying is permitted according to the Site Licence Conditions only 1 Site Licence Conditions Our product is supplied on CD • You may copy the CD for back-up only. • You may store the CD contents
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between them can become depleted of charge carriers‚ and hence non-conductive‚ depending on the relative voltages of the two semiconductor regions. By manipulating this non-conductive layer‚ p–n junctions are commonly used as diodes: circuit elements that allow a flow of electricity in one direction but not in the other (opposite) direction. This property is explained in terms of forward bias and reverse bias‚ where the term bias refers to an application of electric voltage to the p–n junction. [edit]
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