Glass and Silk. A glass rod (-) is rubbed on silk (+). Two balls A and B are suspended by insulating threads. The observations are as follows: I. Both A and B are attracted to the glass rod. II. A is attracted to B. III. B is repelled by the silk. Which of the following is TRUE regarding the system?

Glass and Silk. A glass rod (-) is rubbed on silk (+). Two balls A and B are suspended by insulating threads. The observations are as follows: I. Both A and B are attracted to the glass rod. II. A is attracted to B. III. B is repelled by the silk. Which of the following is TRUE regarding the system?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter18: Electric Charge And Electric Field

Section: Chapter Questions

Problem 43PE: (a) Find the electric field at x = 5.00 cm in Figure 18.52 (a), given that q = 1.00 C. (b) at what...

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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.
Earth has a net charge that produces an electric field of approximately 150 N/C downward at its surface. (a) What is the magnitude and sign of the excess charge, noting the electric field of a conducting sphere is equivalent to a point charge at its center? (b) What acceleration will the field produce on a free electron near Earth’s surface? (c) What mass object with a single extra electron will have its weight supported by this field?
(a) Find the electric field at x = 5.00 cm in Figure 18.52 (a), given that q = 1.00 C. (b) at what position between 3.00 and 8.00 cm is the total electric field the same as that for ? 2q alone? (c) Can the electric field be zero anywhere between 0.00 and 8.00 cm? (d) At very large positive or negative values of x, the electric field approaches zero in both (a) and (b). In which does it most rapidly approach zero and why? (e) At what position to the light of 11.0 cm is the total electric field zero, other than at infinity? (Hint: A graphing calculator can yield considerable insight in this problem.)
(a) What is the direction of the total Coulomb force on q in Figure 18.46 if q is negative, qa= qcand both are negative, and qb= qcand both are positive? (b) What is the direction of the electric field at the center of the square in this situation?
Three charged particles are aligned along the x axis as shown in Figure P22.35. Find the electric field at (a) the position (2.00 m, 0) and (b) the position (0, 2.00 m). Figure P22.35
(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.
A small block of mass m and charge Q is placed on an insulated, frictionless, inclined plane of angle as in Figure P22.31. An electric field is applied parallel to the incline. (a) Find an expression for the magnitude of the electric field that enables the block to remain at rest. (b) If m = 5.40 g, Q = 7.00 C, and = 25.0, determine the magnitude and the direction of the electric field that enables the block to remain at rest on the incline. Figure P22.31
1. In a hydrogen atom the electron 'orbits' the nucleus (or proton) of the atom at about 1 angstrom (1*10-10 m). A. What is the electric field at the position of the electron and proton? b. What is the electric Force felt by both the electron and the proton? c. What's the difference? d. What is the gravitational force acting upon both the electron and the proton? e. Which one is stronger the electric force or the gravitational force?
A 1.00-g cork ball having a positive charge of 2.00 μC is suspended vertically on a 0.500-m-long light string in the presence of a uniform downward-directed electric field of magnitude E = 1.00 × 105 N/C as in Figure P15.56. If the ball is displaced slightly from the vertical, it oscillates like a simple pendulum. (a) Determine the period of the ball’s oscillation. (b) Should gravity be included in the calculation for part (a)? Explain.
A 1.00-g cork ball having a positive charge of 2.00 mC is suspended vertically on a 0.500-m-long light string in the presence of a uniform downward - directed electric field of magnitude E = 1.00 x 105 N/C as in Figure P15.62. If the ball is displaced slightly from the vertical, it oscillates like a simple pendulum. (a) Determine the period of the ball’s oscillation. (b) Should gravity be included in the calculation for part (a)? Explain.
An electron has an initial velocity of 5.00 × 106 m/s in a uniform 2.00 × 105 -N/C electric field. The field accelerates the electron in the direction opposite to its initial velocity. (a) What is the direction of the electric field? (b) How far does the electron travel before coming to rest? (c) How long does it take theelectron to come to rest? (d) What is the electron’s velocity when it returns to its starting point?
1. Two charged bodies, separated by a certain distance, exert a force of 480 mN on each other. a) What will be the force if they are moved so that they are 8 times farther apart?b) What will be the force if they are moved (from the original distance) so that they are only 1/8 as far apart? 2. What is the magnitude of the force a 10 μC charge exerts on a 3.0 mc charge 2.0 metersaway? ).