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  1. K

    Capacitor network finding potential

    For the capacitor network shown in the figure, the potential difference across ab is 12V. Find (a) the total energy stored in this network and (b) the energy stored in the 4.8 uF capacitor. figure: http://i.imgur.com/Wxbuu.png ATTEMPT: PART A: i first did the leftmost 2 capacitors...
  2. K

    Charge sprayed onto a conductor

    An irregular neutral conductor has a hollow cavity inside of it and is insulated from its surroundings. An excess charge of 16.0 nC is sprayed onto this conductor. A) Find the charge on the inner surface of the conductor. B) Find the charge on the outer surface of the conductor. C) Without...
  3. K

    Electric flux through a cube

    A point charge 6.50 nC is at the center of a cube with sides of length 0.260 m. PART A: What is the electric flux through the surface of the cube? PART B: What is the electric flux through one of the six faces of the cube? ATTEMPT: A) Total flux enclosed by the cube = Q / eo...
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    Traveling proton and electric field problem

    A proton is traveling horizontally to the right at 4.20×106 m/s. Find (a)the magnitude and (b) direction (counterclockwise from the left direction) of the weakest electric field that can bring the proton uniformly to rest over a distance of 3.40 cm. Part C: How much time does it take the...
  5. K

    Three negative point charges lie along a line

    Three negative point charges lie along a line as shown in the figure. figure: http://tinyurl.com/7xppvc8 Find the magnitude and direction of the electric field this combination of charges produces at point , which lies 6.00 from the charge measured perpendicular to the line connecting the...
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    Uniform charged ball charge density problem

    A 20-cm radius ball is uniformly charged to 80 nC. (a) What is the ball’s charge density (C/m3)? (b) How much charge is enclosed by spheres at points 5, 10 and 20 cm from the center? (c) What is the electric field strength at points 5, 10 and 20 cm from the center? ATTEMPT: part a: i...
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    Simple electric flux through tetrahedron problem

    A tetrahedron has an equilateral triangle base with 20-cm-long edges and three equilateral triangle sides. The base is parallel to the ground and a vertical uniform electric field of strength 200 N/C passes upward through the object. (a) What is the electric flux through the base? (b) What is...
  8. K

    Coulomb's law electric field charge on y axis

    Is this question worded poorly or is it just me? Three charges are on the y-axis. Charges -q are at y = ±d and charge + 2q is at y = 0. (a) Determine the electric field E along the x-axis. (b) Verify that your answers to part a has the expected behavior as x becomes very small and very...
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    Maximum initial speed the electron can have without hitting the negative plate

    Two parallel plates are 2.0 cm apart and the electric field strength between them is 1.0 × 10^4 N/C. An electron is launched at a 45 degree angle from the positive plate. What is the maximum initial speed v0 the electron can have without hitting the negative plate? i think the answer is...
  10. K

    Electric field formula problem

    An electric field of magnitude E is measured at a distance R from a point charge Q. If the charge is doubled to 2Q and the electric field is now measured at a distance of 2R from the charge, the new measured value of the field will be? ATTEMPT: using the forumla E=(k)(q/r^2) i think the...
  11. K

    Electric flux changing forumla variables

    A point charge Q at the center of a sphere of radius R produces an electric flux of (flux symbol) coming out of the sphere. If the charge remains the same but the radius of the sphere is doubled, the electric flux coming out of it will be? LINK TO ORIGINAL PROBLEM: http://i.imgur.com/e8Tmt.png...
  12. K

    Electric field changing formula variables problem

    If the electric field is E at a distance d from a point charge, its magnitude will be 2E at a distance? ATTEMPT: i think the answer is d/sqrt(2). i used the formula E=(k)(q/d^2) and used test variables. Is this the right answer?
  13. K

    Simple point charge location problem

    Point P in the figure is equidistant from two point charges +Q/-Q of equal magnitude. If a negative point charge is placed at P without moving the original charges, the net electrical force the charges +Q/-Q will exert on it is? figure: http://goo.gl/EAADC ATTEMPT: i think P will move...
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    Uniform electric field problem

    A charge q and a charge 3q are released in a uniform electric field. If the force this field exerts on 3q is F, the force it will exert on q is: i think the answer is F/3. is this right? i used E=F/q.
  15. K

    Placing charges with coulomb's law problem

    Problem: a charge +Q is located at the origin and a second charge, +4Q is at a distance d on the x-axis. where should a third charge, q, be placed, and what should be its sign and magnitude, so that all three charges will be in equilibrium. attempt: I don't know how to solve it fully, but...
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