17_InstSolManual_PDF_Part24 - 17-24 Chapter 17 Fy S(b F and...

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(b) and its components are shown in Figure 17.68b. and is counterclockwise from the axis. 17.69. Set Up: Like charges repel and unlike charges attract. Figure 17.69 Solve: (a) The charges and the forces on the charge are shown in Figure 17.69a. The distance between and is and are equal in magnitude and opposite in direction, so and The resultant force has magnitude and is directed away from the vacant corner. (b) The charges and the forces on the charge are shown in Figure 17.69b. The distance between and is Use coordinates as shown in the figure. and so The resultant force has magnitude and is directed toward the center of the square. 17.70. Set Up: The force on the negatively charged electron is opposite to the direction of the field. Since the field is uniform, the force and acceleration are constant. Use coordinates with upward and to the right. The electron is at when For an electron, and gives and The electric field has magnitude 3.56 3 10 3 N / C.
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