15 positive charges of q are distributed uniformly over the circumference of a circle with radius a. Then another charge of -Q is placed at the center of the circle. Which of the followings are true for this system? I. The force acting on –Q is zero. If-Q is displaced perpendicular to the surface by a small amount and released, it does not come back to the center. II. III. The electrostatic potential energy of -Q is zero. IV. The magnitude of the electric field on-Q is -159Q

15 positive charges of q are distributed uniformly over the circumference of a circle with radius a. Then another charge of -Q is placed at the center of the circle. Which of the followings are true for this system? I. The force acting on –Q is zero. If-Q is displaced perpendicular to the surface by a small amount and released, it does not come back to the center. II. III. The electrostatic potential energy of -Q is zero. IV. The magnitude of the electric field on-Q is -159Q

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter35: The Nature Of Light And The Principles Of Ray Optics

Section: Chapter Questions

Problem 35.8OQ: What is the order of magnitude of the time interval required for light to travel 10 km as in...

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