17_InstSolManual_PDF_Part16

17_InstSolManual_PDF_Part16 - A r 2 5 Å k Q E 2 5 Å k Q E...

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17.46. Set Up: where l is the moment arm. The forces and moment arms are shown in Fig- ure 17.46. The axis is at the midpoint of the line connecting the charges, and perpendicular to the page. Figure 17.46 Solve: Each force produces a clockwise torque, so the net torque is The net torque is clockwise. 17.47. Set Up: Solve: (a) For (b) Now 17.48. Set Up: Solve: For so 17.49. Set Up: Electric fields come out of positive charge and go into negative charge. The electric field is stronger where the electric field lines are closer together. Solve: (a) The field lines go from B to A, so B must be positive and A must be negative. (b) The field lines are closer together near A, so the electric field has greater magnitude near
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Unformatted text preview: A. r 2 5 Å k Q E 2 5 Å k Q E / 10 5 " 10 Å k Q k Q / R 2 5 " 10 R E 2 5 E / 10, E 2 5 k Q r 2 2 . E 5 k Q R 2 . r 5 R , E 5 k Q r 2 E 3 5 k q 1 3 r 1 2 2 5 1 9 k q r 1 2 5 E / 9 r 3 5 3 r 1 . E 2 5 k q 1 2 r 1 2 2 5 1 4 k q r 1 2 5 E / 4 r 2 5 2 r 1 . E 1 5 E 5 k q r 1 2 . r 1 5 1.0 cm, E 5 k q r 2 3.4 3 10 2 11 N # m, t 5 t 1 1 t 2 5 2 t 1 5 2 1 1.95 3 10 2 2 N 21 8.75 3 10 2 10 m 2 5 3.4 3 10 2 11 N # m l 1 5 l 2 5 1 1.75 nm 2 sin 30° 5 8.75 3 10 2 10 m F 1 5 F 2 5 q E 5 1 2.50 3 10 2 6 C 21 7800 N / C 2 5 1.95 3 10 2 2 N F 1 F 2 30 ° 30 ° l 2 l 1 1.75nm 1.75nm axis E t 5 Fl , F S 5 q E S . 17-16 Chapter 17...
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