Aparticle of charge q is fixed at the origin of an xy coordinate system. at t = 0 a particle (m = 0.923 g, q = 4.52 µc is located on the x axis at x = 22.6 cm, moving with a speed of 45.7 m/s in the positive y direction. for what value of q will the moving particle execute circular motion? (neglect the gravitational force on the particle.)

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.