Identical particles 1 and 2 are held a distance r apart, as shown in the figure

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Identical particles 1 and 2 are held a distance r apart, as shown in the figure to the right. The particles have identical masses m1 = m2 = M and identical charges q1 = q2 = Q. What should mass M be if the electrostatic force between the two particles is exactly canceled by the gravitational force between the two particles? Express your answer for M in terms of Q and any necessary physical constants. Suppose that particles 1 and 2 are 'electron-like' in that they each carry charge Q = -e. What mass in kg must the particles have if the electrostatic force cancels the gravitation force between the particles? What is this mass in terms of the electron mass me? The figure below shows an arrangement of four charged particles that are held motionless at the corners of a 'kite'-shaped quadrilateral. Particles 1 and 2 lie on the x-axis at d = -2.00 cm and D = + 3.00 cm, respectively, and both angles theta = 30.0 degree . Particles 1 and 2 are identically charged with q1 = q2 = 8.00 times 10-19 C. Particles 3 and 4 lie on the y-axis and are identically charged with charges q3 = q4 = -1.60 times 10-19 C. Find the angle Greek phi (as shown in the figure) and the distance between charges q2 and q3. Find 2,Net, the net electrostatic force on charge q2. You must draw an appropriately labeled free body diagram for q2, and you must report your final answer in unit-vector notation.

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