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Ch 16/17 Test Review

Ch 16/17 Test Review. Honors Physics. Two charged objects attract each other with a force F. What happens to the force between them if One of the charges is tripled? One charge is tripled and the other is cut in half? The distance between them is decreased to third of the original distance?

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Ch 16/17 Test Review

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  1. Ch 16/17 Test Review Honors Physics

  2. Two charged objects attract each other with a force F. What happens to the force between them if • One of the charges is tripled? • One charge is tripled and the other is cut in half? • The distance between them is decreased to third of the original distance? • Parts b and c happen?

  3. Two charged objects attract each other with a force F. What happens to the force between them if • One of the charges is tripled? 3F • One charge is tripled and the other is cut in half? 1.5F • The distance between them is decreased to third of the original distance? 9F • Parts b and c happen? 13.5F

  4. A 6mC charge is placed at the zero mark of a meter stick and a -3mC charge is placed at the 70 cm mark. What is the electric field at the 40 cm mark? = 637 500 N/C

  5. A 6mC charge is placed at the zero mark of a meter stick and a -3mC charge is placed at the 70 cm mark. At what point on a line joining the two charges is the electric field zero?

  6. For an electron moving in the direction of the electric field, what happens to its • Potential energy? • Electric potential? What if it were a proton instead of an electron? • Potential energy • Electric potential

  7. For an electron moving in the direction of the electric field, what happens to its • Potential energy? increases • Electric potential? decreases What if it were a proton instead of an electron? • Potential energy? decreases • Electric potential? decreases

  8. Starting from rest, an electron falls through a potential difference of 1500 V. What speed does it acquire? me= 9.1 x 10-31 kg, qe= 1.6 x 10-19C What speed would a proton acquire in the same situation? mp=1.67 x 10-27 kg v= 5.4 x 105 m/s

  9. What charge appears on the plates of a 4mF capacitor when it is charged to 200 V? 40 V is placed across a 15mF capacitor. What is the energy stored in the capacitor?

  10. Consider two copper wires. One has 3x the length and 3x the cross-sectional area of the other. How the resistances of these two wires compare? 3x the length = 3x the resistance 3x the x-section = 1/3 the resistance both have the same resistance =length, A = x-sectional area, = resistivity (specific to the material

  11. A toaster is rated at 700W at 120 V. What is the resistance of its heating element?

  12. The monthly (30 days) electric bill included the cost of running a toaster 4 hr/day at 800 W, six 100 W bulbs for 8 hr/day. How much did these items contribute to the cost of the monthly electric bill if electricity costs 10 cents per kWh?

  13. A 10 C charge is 15 m from a point in space (p). What is the magnitude of the acceleration experienced by a proton placed at p? Find the electric field strength first: 4x108 N/C

  14. Q1= 5nC is at (0.2 m,0 ); Q2= -2nC is at (0, 0.3m); Q3 = 6nC is at (0,0). What is the magnitude of the net force on the -2nC charge. -2nC 6nC 5nC F 6,-2 =1.2 x 10 -6 down arrow F 5,-2 = 6.94 x 10-7 south of east 0.36 m 0.3 m 33.7o F 5,-2 x = 6.94 x 10-7 sin 33.7o = 3.85 x 10-7 F 5,-2y = 6.94 x 10-7cos 33.7o = 5.77 x 10 -7 0.2 m Fy = 5.77 x 10 -7 +1.2 x 10 -6 = 1.8 x 10 -6 1.84 x 10 -6 1.8 x 10 -6 0.2o 3.85 x 10-7

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