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12. Consider a non-uniformly charged thin rod, which has been bent into a semicircle with radius R as shown below. The linear charge density on the semicircle is given by A(@) = Ag cos @ (where Ag is a positive constant). A) Determine the direction of the electric field at point P (i.e. the centre of the semicircle). Draw the figure shown on the right in your answer booklet and draw the direction of the electric field on it. B) Find the total charge Q on the semicircle rod in terms of parameters given and any relevant constants. C) Determine the electric potential at Point P in terms of given parameters and any relevant constants