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  1. G

    Electric Field of Nonconducting Solid Sphere

    Homework Statement A nonconducting solid sphere of radius 2.30 cm carries a uniformly distributed positive charge of 8.00×10-9 C. Calculate the magnitude of electric field at 1.60 cm away from the center of sphere Homework Equations E=kqr/R^3 The Attempt at a Solution...
  2. G

    Electric Field due to a Ring of Charge

    In this problem we do not know E and we are looking for z correct? I do not know how to deal with this problem of having two unknowns. I am given R but that is all.
  3. G

    Gravitational/electrostatic Equilibrium on a ramp

    I now got it correct - thank you for your help. I actually tried to use that formula earlier with no success - this time I found that I had been forgetting to square my distance in my calculations. Thank you again for your assistance.
  4. G

    Gravitational/electrostatic Equilibrium on a ramp

    q1 = 1.05 × 10 -7 C is fixed at the base of a plane that makes an angle  with the horizontal direction. A ball of mass m = 1.15 g and a charge q2 =3.10 × 10-8 C is placed into a frictionless groove in the plane that extends directly to the fixed charge. It is allowed to move up and down...
  5. G

    Gravitational/electrostatic Equilibrium on a ramp

    Do you mean I should have the equation: mgsin(theta)=(8.98*10^9)(q1)(q2)/(d^2) instead? I also tried that and have also been unsuccessful. Or is my mistake somewhere else? Thank you for all your help so far.
  6. G

    Gravitational/electrostatic Equilibrium on a ramp

    Well, I do not know theta, the length of the ramp nor the height of the ramp. However, you are correct in that theta is the only unknown I need to solve for. I have been trying mgsin(theta)=(8.98*10^9)(q1)(q2)/[(d^2)(sin(theta))]; however, I have been obtaining the wrong answer. I know m, g, q1...
  7. G

    Gravitational/electrostatic Equilibrium on a ramp

    Distance in terms of height and theta => Normally I would use the sine function. That is sin(theta)=height/hypotenuse. In this instance I know what the hypotenuse is; however, I am not given height and the problem is to find theta. i.e. I know that the ball is 13 cm up the ramp. Since I do...
  8. G

    Gravitational/electrostatic Equilibrium on a ramp

    Homework Statement A ball is at a known height on a certain ramp with an unknown angle theta. The ball has a known charge and a known mass. There is also a known charge at the bottom of the ramp. I am supposed to find the angle theta. Homework Equations F=(8.988x10^9)q1q2/d^2...
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