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17.22.Set Up:Like charges repel and unlike charges attract. The charges and their forces on areshown in Figure 17.22.Figure 17.22q2q3F1q1F2xy0.300m0.200mq3F5k0qqr0r2.2yF5F11F252.5931026NFS2FS1F25k0q2q30r22518.993109N#m2/C2213.2031029C215.0031029C210.400 m2258.9931027N.F15k0q1q30r12518.993109N#m2/C2211.5031029C215.0031029C210.200 m2251.6931026N.xyq3F1q1F20.400m0.200mq2q3F5k0qqr0r2.1.7331028Nu 532.4°.tanu 5FyFx59.2731029N1.4631028N50.6349F5"Fx21Fy251.7331028N.Fy5F1y1F2y59.2731029N.Fx5F1x1F2x51.4631028N;F2y5F2sin65.0°59.2731029N.F2x5F2cos65.0°54.3231029N;F1y50.F1x51.02331028N;17-6Chapter 17
Solve:The net force has magnitudeand is in thedirection.17.23.Set Up:Like charges repel and unlike charges attract. The charges and the forces on thechargesandin the dipole are shown in Figure 17.23. Use the coordinates shown.andFigure 17.23Solve:The net force has magnitude and is in the direction from the to the charge.(b)and each produce clockwise torques and each have a moment arm of 1.50 cm. and each have zeromoment arm and produce no torque.The torque is clockwise.Reflect:The xcomponents of the two forces are in opposite directions so they cancel and the net force has no xcomponent. But the torques of and are in the same direction and therefore produce a net torque.F2xF1xt 52F1x10.0150 m252F1cosu10.0150 m25211.1243103N21cos48.6°210.0150 m2522.3 N#mF2yF1yF2xF1x25.00 mC15.00 mC1.693103NFy5F1y1F2y5 22F1sinu 5 2211.1243103N211.50 cm2.00 cm25 21.693103N.Fx5F1x1F2x50.F15F2518.993109N#m2/C2215.0031026C2110.031026C210.0200 m2251.1243103N.xq1q2q3F1F1xF2xF2yF2F1yy1.50cm1.50cmaxis2.00cmuuu 548.6°.sinu 51.50 cm2.00 cmq2q1F5k0qqr0r2.1x2.4031027NFx5F1x1F2x5 1F12F252.4031027N.F25k0q2q30r22518.993109N#m2/C2215.0031029C210.60031029C210.300 m2252.99731027N.F15k0q1q30r12518.993109N#m2/C2214.0031029C210.60031029C210.200 m2255.39431027N.Electric Charge and Electric Field17-7
17.24.Set Up:In the O-H-N combination the is 0.170 nm from the and 0.280 nm from the In the N-H-N combination the is 0.190 nm from the and 0.300 nm from the other Like charges repel and unlikecharges attract. The net force is the vector sum of the individual forces.Solve: (a)O-H-NattractiverepulsiveN-H-NattractiverepulsiveThe total attractive force is and the total repulsive force is The net force is attractiveand has magnitude (b)The bonding force of the electron in the hydrogen atom is a factor of 10 larger than the bonding force of the adenine-thymine molecules.