15:53Introduction to Electric Charge (Friction, Conduction, Induction) | Doc PhysicsDoc Schuster491views
Multiple ChoiceHow many electrons do you have to add to decrease the charge of an object by 16 μC?1192views28rank6comments
Multiple ChoiceA glass rod is rubbed with silk, and a plastic rod is rubbed with wool. Afterward, to which object or objects will the glass rod be attracted?770views1rank
Multiple ChoiceA ring of charge lies in the xy-plane with its center at the origin. The ring has a radius of 87 cm and a total charge of 130 µC. What is the linear charge density on the ring?740views1comments
Textbook QuestionTwo small aluminum spheres, each having mass 0.0250 kg, are separated by 80.0 cm. (a) How many electrons does each sphere contain? (The atomic mass of aluminum is 26.982 g/mol, and its atomic number is 13.)762views
Textbook QuestionWhat mass of aluminum has a total nuclear charge of 1.0 C? Aluminum has atomic number 13.382views2comments
Textbook QuestionIf a proton and an electron are released when they are 2.0 * 10^-10 m apart (a typical atomic distance), find the initial acceleration of each particle.130views
Textbook Question(II) What is the total charge of all the electrons in a 12-kg bar of gold? What is the net charge of the bar? (Gold has 79 electrons per atom and an atomic mass of 197 u.)128views
Textbook Question(II) A charge Q is transferred from an initially uncharged plastic ball to an identical ball 21 cm away. The force of attraction is then 17 mN. How many electrons were transferred from one ball to the other?159views
Textbook QuestionEstimate the net force between the CO group and the HN group shown in Fig. 21–72. The C and O have charges ± 0.40 e , and the H and N have charges ±0.20e , where e = 1.6 x 10⁻¹⁹ C. [Hint: Do not include the “internal” forces between C and O, or between H and N.]IMAGE>92views
Textbook Question(II) A large electroscope is made with “leaves” that are 66-cm-long wires with tiny 21-g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 26° angle with the vertical (Fig. 21–58), what total charge Q must have been applied to the electroscope? Ignore the mass of the wires. <IMAGE>134views
Textbook QuestionThe molecular mass of water (H₂O) is 18 u. How many protons are there in 1.0 L of liquid water?455views
Textbook Question3.5×10^10 electrons are added to a plastic rod by rubbing it with wool. What is the charge on the rod?289views
Textbook Question"A point charge ( m = 1.5 gram) at the end of an insulating cord of length 55 cm is observed to be in equilibrium in a uniform horizontal electric field of 9500 N/C , when the pendulum’s position is as shown in Fig. 21–79, with the charge 12 cm above the lowest (vertical) position. If the field points to the right in Fig. 21–79, determine the magnitude and sign of the point charge.<IMAGE>133views
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