21. The 60-g banana-shaped earring illustrated below is suspended in midair in electro- static equilibrium. The earring is connected to the floor by a thread that makes a 60° angle with the vertical. The earring has a charge of +300 µC and there is a uniform electric field directed 60° above the horizontal. (A) Draw a FBD for the earring. Label each force and the x- and y-coordinates. 60° 60° (B) Write the x- and y-sums for the forces acting on the earring. There will be two sums. On the line immediately below each sum, rewrite the left-hand side in terms of the forces. (C) Determine the magnitude of the electric field.

21. The 60-g banana-shaped earring illustrated below is suspended in midair in electro- static equilibrium. The earring is connected to the floor by a thread that makes a 60° angle with the vertical. The earring has a charge of +300 µC and there is a uniform electric field directed 60° above the horizontal. (A) Draw a FBD for the earring. Label each force and the x- and y-coordinates. 60° 60° (B) Write the x- and y-sums for the forces acting on the earring. There will be two sums. On the line immediately below each sum, rewrite the left-hand side in terms of the forces. (C) Determine the magnitude of the electric field.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter15: Electric Forces And Fields

Section: Chapter Questions

Problem 22P: A small sphere of charge q = +68 C and mass m = 5.8 g is attached to a light string and placed in a...

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A small sphere of charge q = +68 C and mass m = 5.8 g is attached to a light string and placed in a uniform electric field E. that makes ail angle = 37 with the horizontal. The opposite end of the string is attached to a wall and the sphere is in static equilibrium when the string is horizontal as in Figure P15.22. (a) Construct a free body diagram for the sphere. Find (b) the magnitude of the electric field and (c) the tension in the string.
A small sphere of charge q = +68 C and mass m = 5.8 g is attached to a light string and placed in a uniform electric field E. that makes ail angle = 37 with the horizontal. The opposite end of the string is attached to a wall and the sphere is in static equilibrium when the string is horizontal as in Figure P15.22. (a) Construct a free body diagram for the sphere. Find (b) the magnitude of the electric field and (c) the tension in the string.
A circular ring of charge of radius b has a total charge q uniformly distributed around it. Find the magnitude of the electric field in the center of the ring. (a) 0 (b) keq/b2 (c) keq2/b2 (d) keq2/b (e) None of these answers is correct.
A thin, square, conducting plate 50.0 cm on a side lies in the xy plane. A total charge of 4.00 108 C is placed on the plate. Find (a) the charge density on each face of the plate, (b) the electric field just above the plate, and (c) the electric field just below the plate. You may assume the charge density is uniform.
(a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in Figure P15.10. (b) If a charge of 2.00 C is placed at this point, what are the magnitude and direction of the force on it?
(a) Determine the electric field strength at a point 1.00 cm to the left of the middle charge shown in Figure P15.10. (b) If a charge of 2.00 C is placed at this point, what are the magnitude and direction of the force on it?
A point charge of 4.00 nC is located at (0, 1.00) m. What is the x component of the electric field due to the point charge at (4.00, 2.00) m? (a) 1.15 N/C (b) 0.864 N/C (c) 1.44 N/C (d) 1.15 N/C (e) 0.864 N/C
A uniformly charged insulating rod of length 14.0 cm is bent into the shape of a semicircle as shown in Figure P 19.21. The rod has a total charge of 7.50 C. Find (a) the magnitude and (b) the direction of the electric field at O, the center of the semicircle.
(a) Using the symmetry of the arrangement, determine the direction of the electric field at the center of the square in Figure 18.53, given that qa= 1.00C and qc=qd= +1.00 C. (b) Calculate the magnitude of the electric field at the location of q, given that the square is 5.00 cm on a side.
Three charged particles are located at the corners of an equilateral triangle as shown in Figure P19.9. Calculate the total electric force on the 7.00-C charge.
Three identical charges (q = 5.0 C.) lie along a circle of radius 2.0 m at angles of 30, 150, and 270, as shown in Figure P15.33 (page 524). What is the resultant electric field at the center of the circle? Figure P15.33
A small, 2.00-g plastic ball is suspended by a 20.0-cm-long string in a uniform electric field as shown in Figure P19.67. If the hall is in equilibrium when the string makes a 15.0 angle with the vertical, what is the net charge on the ball?