73. If 120 J of work is performed to move 2.4 C of charge from the...

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73. If 120 J of work is performed to move 2.4 C of charge from the positive plate to the negative plate shown in Figure 23, what potential difference exists between the plates? + + + + + + 2.4 C ||||II Figure 23 74. How much work is done to transfer 0.15 C of charge through an electric potential difference of 9.0 V? 75. An electron is moved through an electric potential difference of 450 V. How much work is done on the electron? 76. A 12-V battery does 1200 J of work transferring charge. How much charge is transferred? 77. The electric field intensity between two charged plates is 1.5x10³ N/C. The plates are 0.060 m apart. What is the electric potential difference, in volts, between the plates? 78. A voltmeter indicates that the electric potential dif- ference between two plates is 70.0 V. The plates are 0.020 m apart. What electric field intensity exists between them? 79. A capacitor that is connected to a 45.0-V source has a charge of 90.0 μC. What is the capacitor's capacitance? 80. The oil drop shown in Figure 24 is negatively charged and weighs 4.5×10-15 N. The drop is suspended in an electric field intensity of 5.6x10³ N/C. a. What is the charge on the drop? b. How many excess electrons does it carry? + + Figure 24 + + + + + 8.5x10-15 N 73. If 120 J of work is performed to move 2.4 C of charge from the positive plate to the negative plate shown in Figure 23, what potential difference exists between the plates? + + + + + + 2.4 C ||||II Figure 23 74. How much work is done to transfer 0.15 C of charge through an electric potential difference of 9.0 V? 75. An electron is moved through an electric potential difference of 450 V. How much work is done on the electron? 76. A 12-V battery does 1200 J of work transferring charge. How much charge is transferred? 77. The electric field intensity between two charged plates is 1.5x10³ N/C. The plates are 0.060 m apart. What is the electric potential difference, in volts, between the plates? 78. A voltmeter indicates that the electric potential dif- ference between two plates is 70.0 V. The plates are 0.020 m apart. What electric field intensity exists between them? 79. A capacitor that is connected to a 45.0-V source has a charge of 90.0 μC. What is the capacitor's capacitance? 80. The oil drop shown in Figure 24 is negatively charged and weighs 4.5×10-15 N. The drop is suspended in an electric field intensity of 5.6x10³ N/C. a. What is the charge on the drop? b. How many excess electrons does it carry? + + Figure 24 + + + + + 8.5x10-15 N

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