please solve. all the information is there.

Problem 4: A thin, non-conducting rod is in the shape of a semicircle of radius R. It has a varying charge per unit length 1 described by 1 = 1, sin 20, where O is defined in the figure. a. Sketch the charge distribution along the semicircle. X Is the charge in the left half of the semicircle 0 positive or negative? b. What is the direction of the electric field E at point ), the center of the semicircle? c. Find the magnitude of the electric field at point O