Understanding Electric and Magnetic Fields: Key Concepts
School
Virginia Commonwealth University**We aren't endorsed by this school
Course
PHYS 202
Subject
Physics
Date
Dec 12, 2024
Pages
4
Uploaded by SuperDugongPerson1223
Name:_________________________________ 1.The figure below shows four thin parallel charged plates with equal separation. What is the field at point Bin terms of 𝜎𝜀0? What is the field at point Din terms of 𝜎𝜀0? What is the field at point Ein terms of 𝜎𝜀0? If σ=1nC/m2, what is the electric field at E in N/C? 2. The potential is lowestat point E. What direction does the Electric field point at D? A) North B) South C) East D) West 3.If you moved a positive charge from C to E, what kind of work did you do? a)Positive b) Negative c) None
3. The electrostatic force on a charge is greater at point A than at point B. A) True B) False? 5.An electric field of strength E = 3000 N/C is directed along the +x-axis as shown. An electron is initially at rest at point B. If the distance between A and B is 20 cm, then what is the voltage difference between A and B? 4.What is the difference in electric potential energy of the electron at point B and point A? 5.How fast will the electron be moving when it reaches point A? In the right figure, the top panel of graph shows the potential V as a function of position x in three regions I, II, and III. Accordingly, four parallel plates, A through D, can be setup to realize the distribution of potential, as schematically drawn in the bottom panel of the figure. The unit of the distance is cm, and the unit of potential is V. 6. In which region is the Electric Field pointing to the right? A) I B) II C) III 7.If you released a negatively charged particle in the middle of region III, which way would it accelerate? A) Left B) Right C) No acceleration 8.In which region is the electric field the smallest? A) I B) II C) III
9.In the figure to the right, the direction of the Magnetic force on a positive particle with velocity vin the B-field is _________. (a) Right (b) Left (c) Up (d) Down (e) In (f) Out10. In the figure shown to the right, a wire is oriented vertically across the screen with a current that is moving up . The direction of the magnetic field B at point to the right of the wire is _________. (a) Right (b) Left (c) Up (d) Down (e) In (f) Out 11. We have a magnetic field going into the page. A positively charged particle is fired to right and into the field. What is the direction of the magnetic force? If the magnetic field is replaced with an electric field, which direction would the force point? a)Left b) Right c) Up d) Down e) In f) Out Analyze electromagnetic coil below. 12.In which direction does the field lines point through the center of the coil? a)Left b) Right c) Up d) Down e) In f) Out 13.Which Magnet is attracted to the electromagnetic coil? A) B) C) Both D) Neither +
Consider the two wires below with the current coming out of the page on the right and left.14.In which direction does the magnetic field due to the current through wire one point at wire 2? a)Left b) Right c) Up d) Down e) In f) Out 15.In which direction does the force on wire 2 point. a)Left b) Right c) Up d) Down e) In f) Out 16.In which direction does the force on wire 1 point? a)Left b) Right c) Up d) Down e) In f) Out 17. Consider the velocity selector shown below. Draw the Free body diagram for a Positively charged particle, and for a negatively charged particle. FBD Positive FBD Negative 1 1