Two small balls, each of mass 3.0 g, are attached to silk threads 30 cm long, which are in turn tied to the sar point on the ceiling, as shown in the figure. When the balls are given the same charge Q, the threads hang a 0 = 3.0° to the vertical.

Three charges, q1 = 1 µC, q2 = 2 µC and q3 = 3 µC are placed in a line with 20 cm between %3D each of them. So qat a = 0, q2 at z = 20 cm and q3 at z = 40 cm. Calculate the energy stored in the collection of charges. (a) -0.62 J (b) -0.43 J (c) +0.43 J (d) +0.62 J

The figure shows two tiny 5.0-g spheres suspended from two very thin 1.0-m-long threads. The spheres repel each other after being charged to +28 nano-coulombs and hang at rest as shown. What is the angle θ? (k = 1/4πε 0 = 8.99 × 109 N · m2/C2)

The figure shows two tiny 5.0-g spheres suspended from two very thin 1.0-m-long threads. The spheres repel each other after being charged to +91 nC and hang at rest as shown. What is the angle θ? (k = 1/4πε0 = 8.99 × 10^9

Two hard rubber spheres, each of mass m = 14.9 g, are rubbed with fur on a dry day and are then suspended with two insulating strings of length L = 5.25 cm whose support points are a distance d = 3.06 cm from each other as shown in the figure below. During the rubbing process, one sphere receives exactly twice the charge of the other. They are observed to hang at equilibrium, each at an angle of 0 = 10.4° with the vertical. Find the amount of charge on each sphere. (Enter your answers from smallest to largest.)

A small metal sphere, carrying a net charge of qt= +7.5 mC, is held in a stationary position by insulating supports. A second small metal sphere, with net charge of 2' +3 mC and mass 2 g is projected toward q . When two spheres are 0.8 m apart, sa is moving toward qt with speed 22.0 mls, see Figure. Assume that the two spheres can be treated as point charges. Neglect the force of gravity. a)  What is the speed ofqt when the spheres are 0.5 m apart† How close can q2 approach to q1 ?

A charge Q= 3nC is uniformly distributed over a ring of radius a = 6 cm. An electron is released from rest at point C, which is 8 cm away from the center O of the ring. Find the speed (in 10° m/s) of the electron as it passes through point O. Hint: me = 9.11x10-3 kg.

In the figure, an electron is shot from an infinite distance along the y axis and through the origin. Three other charged particles are fixed in place on the axes. The electron has an initial speed of vo = 15.0 m/s. What is its speed (m/s) when it passes through the origin? 91 = +6e (left and right sides) 92 = -5e d = 2.00 m 7 d 72 71

Two hard rubber spheres, each of mass m = 14.9 g, are rubbed with fur on a dry day and are then suspended with two insulating strings of length L = 5.25 cm whose support points are a distance d = 3.06 cm from each other as shown in the figure below. During the rubbing process, one sphere receives exactly twice the charge of the other. They are observed to hang at equilibrium, each at an angle of 0 = 10.4° with the vertical. Find the amount of charge on each sphere. (Enter your answers from smallest to largest.) с C Need Help? Submit Answer m Read It L 18 m

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