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causes obj to accelerate along the path shown towards point B. What is the veloc- ity of the object when it reaches point B (VB = +100 V)? -800 V -350 V -200 V -50 V +100 V B

causes obj to accelerate along the path shown towards point B. What is the veloc- ity of the object when it reaches point B (VB = +100 V)? -800 V -350 V -200 V -50 V +100 V B

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need help with 28.18 please

(a) How much work was done on the (d) How much work is done on the proton by the electric field? charge by the electric field when moving the charge from point C to point B? (b) How much work was done on the proton by the external force? 28.14 In a region of space there is a uni- form 6000 N C-1 electric field like that shown in Figure 28.24. E = 6000 NC-¹ B 4 cm| 3 cm 5 cm A Figure 28.24 Three points in a region of uniform electric field. (c) (a) What is the potential difference be- tween points A and B? Which point is at the lower electrical potential? (b) What is the potential difference be- tween points A and C? Which point is at the lower electrical potential? What is the potential difference be- tween points B and C? Which point is at the lower electrical potential? (c) 28.15 A charge of +0.1 µC is placed at point A in Figure 28.24. (a) How much work is done on the charge by the electric field when moving the charge from point A to point B? (b) How much work is done on the charge by the electric field when moving the charge from point B to point A? How much work is done on the by the electric field when moving the charge from point B to point C? 28.16 What is the potential difference be- tween points A and D in Figure 27.19? 28.17 Use Figure 28.25 to answer the fol- lowing questions. -20 V +40 V +100 V+100 V viii B E juk 160 V Figure 28.25 The electric field and some equipotentials in the region around two positive charges. (d) (a) What is the potential difference be- tween points A and B? (b) How much work does the electric field do on a -0.5 C charge that is moved from A to C? If a +6C charge is released from point E which path would it take? causes Qobj to accelerate along the path shown towards point B. What is the veloc- ity of the object when it reaches point B (VB = +100 V)? 28.18 A charge Qo = -0.5 µC is placed in a region of space far from any other charges and is fixed so that it cannot move. Some equipotential lines around this charge are shown in Figure 28.26. A small object with a mass of mobj = 5 mg and a charge obj = -0.8 nC is ced point A (VA= -800 V) and released. The repulsive force between the two charges -800 V -350 V -200 V -50 V +100 V Figure 28.26 Equipotentials around an isolated point charge. (c) If a -5 C charge is released from (b) How much work must be done on point D which path would it take? a sodium ion (Na+) to move it from inside the cell to outside the cell? 28.19 At rest, the potential inside a nerve cell is lower than that of the extracellular fluid. The membrane potential, the po- tential difference between the inside and outside of the cell membrane, is 70 mV. (a) What is the change in electrical po- tential energy of the sodium ion when moving from inside the cell to outside the cell? 28.20 An electron at an initial electrical potential of 0 V is fired towards a sec- ond electron which is held fixed in space. The moving electron was fired at an ini- tial speed of 1 x 104 m s-¹. When the moving electron is 5.11 × 10-6 m from the fixed electron it's speed has been reduced to 1 x 10³ m s-¹. What is the electrical potential due to the fixed electron at this point?
Transcribed Image Text:(a) How much work was done on the (d) How much work is done on the proton by the electric field? charge by the electric field when moving the charge from point C to point B? (b) How much work was done on the proton by the external force? 28.14 In a region of space there is a uni- form 6000 N C-1 electric field like that shown in Figure 28.24. E = 6000 NC-¹ B 4 cm| 3 cm 5 cm A Figure 28.24 Three points in a region of uniform electric field. (c) (a) What is the potential difference be- tween points A and B? Which point is at the lower electrical potential? (b) What is the potential difference be- tween points A and C? Which point is at the lower electrical potential? What is the potential difference be- tween points B and C? Which point is at the lower electrical potential? (c) 28.15 A charge of +0.1 µC is placed at point A in Figure 28.24. (a) How much work is done on the charge by the electric field when moving the charge from point A to point B? (b) How much work is done on the charge by the electric field when moving the charge from point B to point A? How much work is done on the by the electric field when moving the charge from point B to point C? 28.16 What is the potential difference be- tween points A and D in Figure 27.19? 28.17 Use Figure 28.25 to answer the fol- lowing questions. -20 V +40 V +100 V+100 V viii B E juk 160 V Figure 28.25 The electric field and some equipotentials in the region around two positive charges. (d) (a) What is the potential difference be- tween points A and B? (b) How much work does the electric field do on a -0.5 C charge that is moved from A to C? If a +6C charge is released from point E which path would it take? causes Qobj to accelerate along the path shown towards point B. What is the veloc- ity of the object when it reaches point B (VB = +100 V)? 28.18 A charge Qo = -0.5 µC is placed in a region of space far from any other charges and is fixed so that it cannot move. Some equipotential lines around this charge are shown in Figure 28.26. A small object with a mass of mobj = 5 mg and a charge obj = -0.8 nC is ced point A (VA= -800 V) and released. The repulsive force between the two charges -800 V -350 V -200 V -50 V +100 V Figure 28.26 Equipotentials around an isolated point charge. (c) If a -5 C charge is released from (b) How much work must be done on point D which path would it take? a sodium ion (Na+) to move it from inside the cell to outside the cell? 28.19 At rest, the potential inside a nerve cell is lower than that of the extracellular fluid. The membrane potential, the po- tential difference between the inside and outside of the cell membrane, is 70 mV. (a) What is the change in electrical po- tential energy of the sodium ion when moving from inside the cell to outside the cell? 28.20 An electron at an initial electrical potential of 0 V is fired towards a sec- ond electron which is held fixed in space. The moving electron was fired at an ini- tial speed of 1 x 104 m s-¹. When the moving electron is 5.11 × 10-6 m from the fixed electron it's speed has been reduced to 1 x 10³ m s-¹. What is the electrical potential due to the fixed electron at this point?
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