(a) Two thin hollow plastic spheres, about the size of a ping-pong ball with masses (m, = m2 = 2e-3 kg) have been rubbed with wool. Sphere 1 has a charge q, = -8e-9 C and is at location < 30e-2, -20e-2, 0 m. Sphere 2 has a charge q2 = -3e-9 C and is at location < -30e-2, 30e-2, 0> m. It will be useful to draw a diagram of the situation, including the relevant vectors. What is the relative position vector pointing from q, to q2? (-60e – 2,50e – 2,0) m What is the distance between q, and q2? FI = 781 What is the unit vector ? in the direction of 7? - (-.77,.64,0) phy What is the magnitude of the gravitational force exerted on q2 by q1? Op Fgrav on q,l = 4.374e-16 Vi 0Syn What is the gravitational force (vector) exerted on q2 by aj? Rel Fgrav on g, =(-3.37e – 16,2.799e – 16.0)

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