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Chapter 22: Q. 31 - Excercises And Problems (page 625)
The electric field 2.0 cm from a small object points away from the object with a strength of 270,000 N/C. What is the object鈥檚 charge?
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The force on the nCcharge is as shown inFIGURE CP22.76.What is the magnitude of this force?
Metal sphere in FIGURE has units of negative charge and metal sphere has units of positive charge. The two spheres are brought into contact. What is the final charge state of each sphere? Explain.
Charged plastic and glass rods hang by threads.
a. An object repels the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?
b. A different object attracts the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?
Two 5.0 g point charges on 1.0-m-long threads repel each other after being charged to +100 nC, as shown in FIGURE P22.62. What is the angle ? You can assume thatis a small angle.
A Van de Graaff generator is a device that accumulates electrons on a large metal sphere until the large amount of charge causes sparks. As you鈥檒l learn in Chapter , the electric field of a charged sphere is exactly the same as if the charge were a point charge at the center of the sphere. Suppose that a diameter sphere has accumulated extra electrons and that a small ball 50 cm from the edge of the sphere feels the force , away from sphere). What is the charge on the ball?
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