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? The force acting on +Q is zero. II. +Q I. If +Q is displaced perpendicular to the surface by a small amount and released, it does not come back to the center. III. The electrostatic potential energy of +Q is 159Q IV. The magnitude of the electric field on +Q is 159Q /sz€ga² •
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? The force acting on +Q is zero. II. +Q I. If +Q is displaced perpendicular to the surface by a small amount and released, it does not come back to the center. III. The electrostatic potential energy of +Q is 159Q IV. The magnitude of the electric field on +Q is 159Q /sz€ga² •
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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?
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.
+Q
I.
III. The electrostatic potential energy of +Q is
15q9/Απέρα?s
IV. The magnitude of the electric field on +Q is
159Q
4περα23
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