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Q. A particle moving in simple harmonic motion passes through the equilibrium point (x = 0) 6 times per second. At t = 0 its velocity at x = -0.08125 m is negative. It travels 0.65 m in a complete cycle.

Q. Four point charges have the same magnitude of 2.4 × 10^-6 C and are fixed to the corners of a square that is 79.5 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the force experienced by the negative charge.

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