11. A particle with charge q is located at x = 2R, and a particle with charge −2q is located at the origin. The equipotential surface that has zero potential is a sphere centered at (−4R/3, 0, 0) and having a radius ________.

6. A uniform spherical planet has mass M and radius R. A very thin tunnel passes from one end of the planet, through the planet center, and then out from the other end of the planet. A particle of mass m fell into one end of the tunnel and then performed simple harmonic motion. Find the angular frequency of the simple harmonic motion.

11. A particle with charge q is located at x = 2R, and a particle with charge −2q is located at the origin. The equipotential surface that has zero potential is a sphere centered at (−4R/3, 0, 0) and having a radius ________.

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