(a) $C_{AB} = 3 + \frac{3}{3} = 4\mu F\ ,\ C_{AC} = \frac{3}{2} + \frac{3}{2} = 3\mu F$ $\therefore C_{AB}:C_{AC} = 4\ :3$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.