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The drawing shows a two-dimensional coordinate system where z is the origin between the x and y axes. A phasor E is shown tracing a circle with radius a, with z as the center, moving clockwise at a speed, omega. E makes an angle, psi with the positive x-axis. A clasped right hand is shown next to the drawing, with the thumb pointing in the z-direction out of the page, and the fingers pointing at the counterclockwise movement of the phasor.