Exploring Electric Potential When answering questions, say it well but say it briefly INCLUDE YOUR GRAPH FOR PART 2 Part 1 What is an equipotential line and how is this simulation related to work and energy 1) Go to the PhET simulations. (phet.colorado.edu) 2) From the list on the left choose Electricity, Magnets, and Circuits. 3) Now pick Charges and Fields. 4) Turn on Show Numbers 5) Place a positive 1 nano-coulomb charge near the center of the screen. 6) In the lower left of the screen is a meter for indicating electric potential, in volts, created by the charge that you introduced. Record the voltage and turn on Plot. 7) This line is much like a line on a geologic topo map. Explain the similarity. 8) You are on the side of a hill with a topo map of the region. If you walked so that your trip follows a topo line you would be doing no work on your backpack. Why. 9) If a second charge were placed on this line (dont do it), how much work is need to move it along the line 10) Move the meter closer to the charge at the center of the screen. What is the new electric potential Turn on plot again 11) Remember that electric potential is energy per charge (1 volt 1 Joule/Coulomb). Is electric potential a vector or a scalar 12) If a second positive charge were introduced and moved from the first equipotential line created to the second line (closer to the charge), would this involve positive or negative work 13) Explain. 14) If the second positive charge were moved away from the first Positive charge, would this involve positive or negative work. 15) Click on Clear All Part 2 What is the relationship between the electric potential at a point in space and the distance from an electric charge Place a positive 1 nano-coulomb charge on the screen. Turn on Show numbers Turn on tape measure. Use the tape measure to find and record the distance from the charge to the equipotential sensor. Record the voltage as indicated on the equipotential sensor. Change the location of the positive charge to at least six widely different distances from the equipotental sensor. Record the voltage reading and distance at each location. Use Excel to graph these data sets. Include your graph to turn in with this handout. (all graphs need a title, axes labeled and units) What is the mathematical relation between these variables (hint use power trend…
of coordinate system !!!
Cross (or vector) product of 2 vectors
C A B C AB sin n
Angle b/w A and B
A B B A
Defining the direction of the normal vector in cross product
Electric charge and
Electricity and Magnetism, Some History: 1
• Many applications
– Macroscopic and microscopic
– Documents suggest that magnetism was observed as
early as 2000 BC
– Electrical and magnetic phenomena as…
ME0005 – Foundations of Physics
Current and Charge
All familiar with electric circuits: lighting, computers, mobile
A current is a flow of charged particles
Scientific convention: current flows from positive (+ve) to
negative (-ve) conventional current
What is flowing?
In a metal wire there are free electrons that can move
about conduction electrons they allow a metal to
conduct an electric current
Electrons are negatively charged. When an electron
positive charge are contained in a small core called the nucleus
Most of the volume of the atoms is empty through which tiny, negatively charged electrons are dispersed.
There are as many negatively charged electrons outside the nucleus as there are positively charged particles inside the nucleus, so that the atom is electrically neutral
Summarize the nature of electrical charge
Electrical charge is a fundamental property of protons and electrons
Positive and negative electrical charges attract…
require 16-20 hours to recharge, 8 hours with level 2 and less than one hour with level 1.
level 1 charging is the most basic and is done from a regular household electrical socket with 120volts at 15 or 20amps. It takes 16-20 hours to full charge.
The level 1 charging is not recommended to be fixed in hospitals since this level is not different from that normal socket available in household and this is already installed in every household and in hospitals too. So this makes level 1 out of…
the problem, when it will be possible to resolve (at our discretion) any issues not covered by this warranty agreement and for which a
charge would normally be made (see paragraph 5).
3. Service will be carried out to the equipment only at the address(es) shown above subject to any agreement by the parties to the contrary.
There may be additional charges for onsite visits or collections from another address.
4. The customer will allow Remtek Systems Limited, at our own discretion, to remove…
they both have opposite charges so that is why they can attract each other.
B. How many types of charge did you work with in this exercise? How do you know?
* I worked on 2 charges because I worked with tapes that I charged in the desktop doing the same procidures just charging them with the desktop. And also the ruler that I also charged to be able to attract it to the tape but the ruler I attracted it with the rabbit fur.
C. If a third type of charge existed, how would it…
electroscope and record. | It got neutral and the leaves go down. |
Charge the ebonite rod. Bring the rod close and observe. | It rose because of the charge that goes to the electroscope. |
Try moving the ebonite rod closer to and further away from the electroscope and observe the leaves. | It stays raised and the charge does not go from the electroscope. |
Analyze and evaluate
(a) Step 4 part A: series of diagrams showing how the charges in the electroscope were affected by the negatively charged…
Know about electric charges and how they interact with each other. Charge of electron
2. What is meant by charging? Charging by friction and charging by contact.
3. polarization of electric charges - local (in insulators) and global (in conductor)
difference between electric conductors and insulators. Understand how the atomic
model is used to explain them, free (free to move) electron inside a conductor and tightly
bound electrons in insulators.
4. Calculating the electric force between…
Lab chapter 18
3) 4volts plot is on
4) The line shown only shows where the 1 positive coulomb’s electric field is making contact with the puck in its field although the electric field is actually a three dimension sphere of energy. Much like a geologic topo map shows different elevations as equal evenly spaced single lines. So the voltage of the coulomb’s electric field is to be compared to the elevation of a geologic topo map, the circle or area increases with increase of elevation…
Unit II Electrostatics
In this chapter we will discuss on the followings:
• Coulomb's Law
• Electric Field & Electric Flux Density
• Gauss's Law with Application
• Electrostatic Potential, Equipotential Surfaces
• Boundary Conditions for Static Electric Fields
• Capacitance and Capacitors
• Electrostatic Energy
• Laplace's and Poisson's Equations
• Uniqueness of Electrostatic Solutions
• Method of Images
• Solution of Boundary Value Problems in Different Coordinate…