Questions 17-18 A very long metal pipe has inner and outer radii of a and b, respectively. As shown in the figure, a uniformly charged thin wire lies along the axis of the pipe. Linear charge density of the wire is A. 17. Which of the following is the magnitude of the electric field at a distance r> b from the wire? X 1 (a) (b) (d) 0 (e) 2πer² 4π€ ² A 4πeor 18. Which of the following is the potential difference Va/2-V26? X(4b-a) (a) 0 (b) X(4b-a) 8®coab 4π€ ab (c) In X TEO 4b a A 2πer (d) (e) A ln 2 TED

Questions 17-18 A very long metal pipe has inner and outer radii of a and b, respectively. As shown in the figure, a uniformly charged thin wire lies along the axis of the pipe. Linear charge density of the wire is A. 17. Which of the following is the magnitude of the electric field at a distance r> b from the wire? X 1 (a) (b) (d) 0 (e) 2πer² 4π€ ² A 4πeor 18. Which of the following is the potential difference Va/2-V26? X(4b-a) (a) 0 (b) X(4b-a) 8®coab 4π€ ab (c) In X TEO 4b a A 2πer (d) (e) A ln 2 TED

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter19: Electric Forces And Electric Fields

Section: Chapter Questions

Problem 24P

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Example 23.3 derives the exact expression for the electric field at a point on the axis of a uniformly charged disk. Consider a disk of radius R = 3.00 cm having a uniformly distributed charge of +5.20 C. (a) Using the result of Example 23.3, compute the electric field at a point on the axis and 3.00 mm from the center. (b) What If? Explain how the answer to part (a) compares with the field computed from the near-field approximation E = /20. (We derived this expression in Example 23.3.) (c) Using the result of Example 23.3, compute the electric field at a point on the axis and 30.0 cm from the center of the disk. (d) What If? Explain how the answer to part (c) compares with the electric field obtained by treating the disk as a +5.20-C charged particle at a distance of 30.0 cm.
Refer 10 Figure 15.20. The charge lowered into the center of the hollow conductor has a magnitude of 5 C. Find the magnitude and sign of the charge on the inside and outside of the hollow conductor when the charge is as shown in (a) Figure 15.20a, (b) Figure 15.20b, (c) Figure 15.20c, and (d) Figure 15.20d.
A test charge of + 3 C is at a point P where the electric field due to other charges is directed to the right and has a magnitude of 4 106 N/C. If the test charge is replaced with a charge of 3 C, the electric field at P (a) has the same magnitude as before, but changes direction, (b) increases in magnitude and changes direction, (c) remains the same, or (d) decreases in magnitude and changes direction.
A test charge of + 3 C is at a point P where the electric field due to other charges is directed to the right and has a magnitude of 4 106 N/C. If the test charge is replaced with a charge of 3 C, the electric field at P (a) has the same magnitude as before, but changes direction, (b) increases in magnitude and changes direction, (c) remains the same, or (d) decreases in magnitude and changes direction.
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