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An electrically charged particle q moves in a circle with radius a and angular speed w on a plane. Determine the Liénard-Wiechert potential (vector potential only) in the following positions: a) at a point that lies on the axis of the circle (perpendicular to the plane P) and at a distance a from the center of the circle; b) at a point that lies in the plane P, at a distance 2a from the center of the circle and have an angle difference Ad (tr) from the point of charge retardation; c) at a point that lies in the plane P, at a distance a/2 from the center of the circle and have an angle difference Av (tr) from the point of charge retardation; d) at the point located at the center of the circle.