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. II. If +Q is displaced perpendicular to the surface by a small amount and released, it does not come back to +Q the center. II. The electrostatic potential energy of +Q is IV. The magnitude of the electric field on +Q is 159Q /¼n€qa² •
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. II. If +Q is displaced perpendicular to the surface by a small amount and released, it does not come back to +Q the center. II. The electrostatic potential energy of +Q is IV. The magnitude of the electric field on +Q is 159Q /¼n€qa² •
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Transcribed Image Text: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?
1. The force acting on +Q is zero.
II. If +Q is displaced perpendicular to the surface by a
small amount and released, it does not come back to
+Q
the center.
II. The electrostatic potential energy of +Q is
15q
/4t€qa² •
IV. The magnitude of the electric field on +Q is
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