1. S

    Parallel plate capacitor

    Here is the question... A parallel plate capacitor with paper between the plates has an electric field of 9.31 104 V/m between the plates. The plates are 1.75 mm apart and the charge on each plate is 0.775 µC. Find the capacitance of this capacitor. 1 F Find the area of each plate. 2...
  2. D

    Electric Field between two infinitely long parallel planes

    "Two infinite planes of charge lie parallel to each other and to the yz plane. One is at x = -4 m and has a surface charge density of σ = -3.2 µC/m2. The other is at x = 4 m and has a surface charge density of σ = 5.8 µC/m2. Find the electric field for the following locations." (a) x < -4 m...
  3. M

    Parallel Plates Electric Field

    Hello, I wonder if anyone could check my answer to this problem. Thanks in advance An electron is liberated from the lower of two parallel plates separated by a distance of 5mm. The upper plate has a p.d. of 1000v relative to the lower plate. How long does it it take for the electron to reach...
  4. M

    Electric Fields and Parallel Plates

    Hi there, I was wondering if someone could check my answers to this past examination question. Thanks in advance. A negatively charged oil drop, mass 2.4 x 10^–12 kg, is stationary between two horizontal metal plates spaced 1 cm apart. Find the number of electrons (to the nearest whole...
  5. M

    Parallel Plate Electric Field

    Hi there, I just wanted to see if anyone could help with the answer to this past examination question as I don't have the answers so not sure if I'm doing them correctly! Thanks in advance. An electron is liberated from the lower of two parallel plates seperated by 5mm. The upper plate has a...
  6. K

    Parallel circuits

    Hello Now, suppose there are one light bulb connected in a complete circuit, later we add one more light bulb to the circuit, in which the bulb is identical to the first one, such that the two bulbs are in parallel. In this case, I think the individual brightness of the two bulbs will...
  7. H

    force between two parallel currents.

    I'll state the problem and then explain. (There's a picture that goes along with this, but I don't think it's necessary, and since I don't know how to get it here, I'll leave it out) This figure shows wire 1 in a cross section, the wire is long and straight, carries a current of 4.00mA out of...
  8. M

    two wires with parallel currents T/F

    In the picture below, the two wires carry current i1 and i2, respectively, with positive current to the right. The charge q is positive and has velocity v to the right...
  9. U

    parallel plates

    I dont know where to begin with these one could somebody help me with it (Sweating) Two large, parallel metal plates carry opposite charges of equal magnitude. theyh are separated by 45mm and the potential difference between them is 360 volts. a) what is the magnitude of the electric field...
  10. H

    Capacitors in series? or parallel?

    Q)Four identical capacitors are connected as shown in the figure. The equivalent capacitance across PQ is 0.1 microfarad. If the points R and S are connected by a wire the equivalent capacitance across PQ will become..? (ans: 0.2 micro F) Here's what I think, Initially the capacitors are in...
  11. R

    Circuits Wired Partially in Series and Partially in Parallel

    Determine the power dissipated in the 5.0 ohms resistor in the circuit shown in the drawing. see the attachment for the diagram.
  12. C

    Two Parallel Wires

    Two parallel wires each carry a current of 5.00 A into the plane of the paper. One wire is located at (0.500 m, 0) and the other is at (1.50 m, 0). Determine the magnetic field at: a. (0,0) and b. (0.750 m, 0).
  13. T

    Series and Parallel Circuits

    1. Prove that when n identical resistors of resistance R are connected in parallel the equivalent resistance is R/n. 2. A piece of copper wire of resistance R is cut into 3 equal parts. When these 3 parts are connected in parallel, what is the resistance of the combination? 3. Say you have a...
  14. A

    Force between parallel plates in a capacitor

    Hey guys. So, I got this problem. According to their hint I'm suppose to calculate the work of moving one of the plates and from their, get to the force. I don't have a clue how to do that. I can't find a single formula that can help with that. Can I please have some help...?(Smile) Thanks.
  15. A

    At what angle of incidence is amplitude coefficient of reflection parallel to the inc

    At what angle of incidence is amplitude coefficient of reflection parallel to the incidence plane 0? my solution is that by Fresnell's equation, r//=tan(i-i`)/tan(i+i`)=0, i=i`, for whatever surface,angle of incidence should be 90. is it correct?
  16. I

    Why would an engineer design a circuit with 3 resistors in parallel?

    Why would an engineer design a circuit with 3 resistors in parallel as opposed to just using one resistor with 1/3 the resistance?
  17. A

    Parallel axis theorem

    Hey. I have a question, in the Parallel axis theorem, what's M? Lets take for example a full circle, I know that the moment of inertia is 1/2MR^2. I saw in a question (the solution), that the moment of inertia on every point on the perimeter of the circle is MR^2 + 1/2MR^2 and that got me...