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8. Suppose the two people in the previous problem move toward each other. Calculate the magnitude of the electrical force of one on the other when their separation is reduced by a factor of 10. 9. Two pith balls shown in the diagram below have a mass of 1.0 g each and have equal charges. One pith ball is suspended by an insulating thread. The other charge is brought to within 3.0 cm of the suspended ball (r-0.03 m). The suspended pith ball is deflected from its rest position until the thread forms an angle of 30 with the vertical. At this angle, the ball is in equilibrium. a) Draw a force diagram depicting the forces acting on the suspended ball. Calculate (b) mg (c) Fe (d) the charge on the pith balls 30 0.03 m
4. Two charged spheres are on a friction-less horizontal surface. One has a charge of +3.0 x 106 c. the other a +6.0x 10-6 C charge. Sketch the two spheres, showing all forces on them. Make the length of your force arrows proportional to the strength of the forces. Two positive charges of 6.0 x 10-6 C are separated by 0.50 m. the charges, considering only electrostatic forces. the charges? Is this force repulsive or attractive? 5. Draw a force diagram for each of What is the magnitude of the force between 6. A negative charge of 2.0 x 10-4 C and a positive charge of 8.0 x 10-4 C are separated by 0.30 m What is the magnitude of the force between the charges? Is this force repulsive or attractive? 7. A young man accumulates a charge qi of +2.0 x 10-5 C while sliding out of the front seat of a car. His girlfriend, who had been waiting in the wind, has picked up some extra electrons and now has a charge q of -8.0 x 10-5 C. Draw a sketch of the situation. Estimate the magnitude of the electrical force that each person on the other when separated by a distance of 6.0 m. Is the force attractive or repulsive? exerts
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10 ︸ (09)081 918 mls Fyonn bigwe T(os3&zngー9.eyo?n 3 8.99x 1o9 16 2ニ)2.379メでC -8

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