A parallel plate capacitor consists of square plates of edge length l that are separated by a distance d where d%u300Al. A potential difference delta V is maintained between the plates. A material of dielectric constant k fills half of the space between the plates. The dielectric slab is now withdrawn from the capacitor
(a) Find the capacitance when the left edge of the dielectric is at a distance x from the center of the capacitor.
(b) If the dielectric is removed at a constant speed v, What is the current in the circuit?