Recent content by eltel2910

1. Velocity of an electron exam question

An electron starts from rest 2.82 cm from the center of a uniformly charged sphere of radius 2.17 cm. If the sphere carries a total charge of 1.11×10-9 C, how fast will the electron be moving when it reaches the surface of the sphere? This is an exam question that I got wrong and I am trying...
2. Electric fields and acceleration

Consider a long horizontal conducting wire with charge density = 5.70*10^-12 C/m. A proton (mass = 1.67*10^-27 kg) is placed and released 0.820 m above the wire. What is the magnitude of initial acceleration of the proton? My thought is: a=q*E/m and E is: 2*k*charge density/distance...
3. Cube of capacitors

If I have a cube made out of capacitors, that's one capacitor for everyside for a total of 12 capacitors. Each capacitor is C=4.71 pF. How would I even begin to go about finding the total capacitance? :yuck:
4. Minimum Potential

A charge of 0.883 nC is placed at the origin. Another charge of 0.347 nC is placed at x1 = 13.1 cm on the x-axis. At which point on the x-axis does this potential have a minimum? I do know a few things: A necessary condition for the potential to have a minimum is that its derivative is...
5. Deflection of electron

An electron with a kinetic energy 5000.0 eV (1 eV = 1.602×10-19 J) is fired horizontally over a charged plate with surface charge density +2.0 μC m-2. Taking the positive direction to be upwards (away from plate), what is the vertical deflection of the electron after it has traveled a horizontal...
6. What is the magnitude of charge inside the box

Got it Got it Thanks Doc.
7. What is the magnitude of charge inside the box

like this? so do I set it up like: 18.3 = q/(2Eo). Solving for q and then that would give me one unit and then I would multiply by the volume of the cube (.00414^3)?????
8. What is the magnitude of charge inside the box

have a box that is 4.15 cm on each side. Using a probe I measure on two opposite sides of the box and find a nearly uniform, inward-oriented, perpendicular component of the field with the magnitude of 18.3 N/C. What is the magnitude of charge inside the box?
9. Net force on charges found to be zero

I'm having trouble understanding some of these basic electrostatic priciples and my book isn't much help. I've put them in a true/false format. If I could get at few answers, it would really help me understand this. A positive point charge +q is placed at point p to the right of two...