PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH
- Slides: 23
PHYSICS FOR SCIENTISTS AND ENGINEERS A STRATEGIC APPROACH 4/E Chapter 27 Quick. Check Questions RANDALL D. KNIGHT
Quick. Check 27. 1 A wire carries a current. If both the wire diameter and the electron drift speed are doubled, the electron current increases by a factor of A. 2. B. 4. C. 6. D. 8. E. Some other value. © 2017 Pearson Education, Inc. Slide 27 -2
Quick. Check 27. 1 A wire carries a current. If both the wire diameter and the electron drift speed are doubled, the electron current increases by a factor of A. 2. B. 4. C. 6. D. 8. E. Some other value. © 2017 Pearson Education, Inc. Slide 27 -3
Quick. Check 27. 2 Surface charge is distributed on a wire as shown. Electrons in the wire A. Drift to the right. B. Drift to the left. C. Move upward. D. Move downward. E. On average, remain at rest. © 2017 Pearson Education, Inc. Slide 27 -4
Quick. Check 27. 2 Surface charge is distributed on a wire as shown. Electrons in the wire A. Drift to the right. B. Drift to the left. C. Move upward. D. Move downward. Electric field from nonuniform surface charges is to the right. Force on negative electrons is to the left. E. On average, remain at rest. © 2017 Pearson Education, Inc. Slide 27 -5
Quick. Check 27. 3 Every minute, 120 C of charge flow through this cross section of the wire. The wire’s current is A. 240 A B. 120 A C. 60 A D. 2 A E. Some other value. © 2017 Pearson Education, Inc. Slide 27 -6
Quick. Check 27. 3 Every minute, 120 C of charge flow through this cross section of the wire. The wire’s current is A. 240 A B. 120 A C. 60 A D. 2 A E. Some other value. © 2017 Pearson Education, Inc. Slide 27 -7
Quick. Check 27. 4 The current density in this wire is A. 4 × 106 A/m 2 B. 2 × 106 A/m 2 C. 4 × 103 A/m 2 D. 2 × 103 A/m 2 E. Some other value. © 2017 Pearson Education, Inc. Slide 27 -8
Quick. Check 27. 4 The current density in this wire is A. 4 × 106 A/m 2 B. 2 × 106 A/m 2 C. 4 × 103 A/m 2 D. 2 × 103 A/m 2 E. Some other value. © 2017 Pearson Education, Inc. Slide 27 -9
Quick. Check 27. 5 A and B are identical lightbulbs connected to a battery as shown. Which is brighter? A. Bulb A B. Bulb B C. The bulbs are equally bright. © 2017 Pearson Education, Inc. Slide 27 -10
Quick. Check 27. 5 A and B are identical lightbulbs connected to a battery as shown. Which is brighter? A. Bulb A B. Bulb B C. The bulbs are equally bright. Conservation of current © 2017 Pearson Education, Inc. Slide 27 -11
Quick. Check 27. 6 The current in the fourth wire is A. 16 A to the right. B. 4 A to the left. C. 2 A to the right. D. 2 A to the left. E. Not enough information to tell. © 2017 Pearson Education, Inc. Slide 27 -12
Quick. Check 27. 6 The current in the fourth wire is A. 16 A to the right. B. 4 A to the left. C. 2 A to the right. D. 2 A to the left. Conservation of current E. Not enough information to tell. © 2017 Pearson Education, Inc. Slide 27 -13
Quick. Check 27. 7 Both segments of the wire are made of the same metal. Current I 1 flows into segment 1 from the left. How does current I 1 in segment 1 compare to current I 2 in segment 2? A. I 1 > I 2 B. I 1 = I 2 C. I 1 < I 2 D. There’s not enough information to compare them. © 2017 Pearson Education, Inc. Slide 27 -14
Quick. Check 27. 7 Both segments of the wire are made of the same metal. Current I 1 flows into segment 1 from the left. How does current I 1 in segment 1 compare to current I 2 in segment 2? A. I 1 > I 2 B. I 1 = I 2 Conservation of current C. I 1 < I 2 D. There’s not enough information to compare them. © 2017 Pearson Education, Inc. Slide 27 -15
Quick. Check 27. 8 Both segments of the wire are made of the same metal. Current I 1 flows into segment 1 from the left. How does current density J 1 in segment 1 compare to current density J 2 in segment 2? A. J 1 > J 2 B. J 1 = J 2 C. J 1 < J 2 D. There’s not enough information to compare them. © 2017 Pearson Education, Inc. Slide 27 -16
Quick. Check 27. 8 Both segments of the wire are made of the same metal. Current I 1 flows into segment 1 from the left. How does current density J 1 in segment 1 compare to current density J 2 in segment 2? A. J 1 > J 2 Smaller cross-section area B. J 1 = J 2 C. J 1 < J 2 D. There’s not enough information to compare them. © 2017 Pearson Education, Inc. Slide 27 -17
Quick. Check 27. 9 Both segments of the wire are made of the same metal. Current I 1 flows into segment 1 from the left. How does the electric field E 1 in segment 1 compare to the electric field E 2 in segment 2? A. E 1 > E 2 B. E 1 = E 2 but not zero C. E 1 < E 2 D. Both are zero because metal is a conductor. E. There’s not enough information to compare them. © 2017 Pearson Education, Inc. Slide 27 -18
Quick. Check 27. 9 Both segments of the wire are made of the same metal. Current I 1 flows into segment 1 from the left. How does the electric field E 1 in segment 1 compare to the electric field E 2 in segment 2? A. E 1 > E 2 J = σE B. E 1 = E 2 but not zero C. E 1 < E 2 D. Both are zero because metal is a conductor. E. There’s not enough information to compare them. © 2017 Pearson Education, Inc. Slide 27 -19
Quick. Check 27. 10 Wire 2 is twice the length and twice the diameter of wire 1. What is the ratio R 2/R 1 of their resistances? A. 1/4 B. 1/2 C. 1 D. 2 E. 4 © 2017 Pearson Education, Inc. Slide 27 -20
Quick. Check 27. 10 Wire 2 is twice the length and twice the diameter of wire 1. What is the ratio R 2/R 1 of their resistances? A. 1/4 B. 1/2 C. 1 D. 2 E. 4 © 2017 Pearson Education, Inc. Slide 27 -21
Quick. Check 27. 11 The current through a wire is measured as the potential difference ΔV is varied. What is the wire’s resistance? A. B. C. D. E. 0. 01 Ω 0. 02 Ω 50 Ω 100 Ω Some other value © 2017 Pearson Education, Inc. Slide 27 -22
Quick. Check 27. 11 The current through a wire is measured as the potential difference ΔV is varied. What is the wire’s resistance? A. B. C. D. E. 0. 01 Ω 0. 02 Ω 50 Ω 100 Ω Some other value © 2017 Pearson Education, Inc. Slide 27 -23
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