The figure below shows a capacitor that consists of two concentric spherical metal shells with radii a and b. The outer shell (with radius b) has charge +Q, and the inner shell (with radius a) has charge -Q. The distance between point A and the center of the spherical shells is rA, and the distance between point B and the center is r13. (a) [2] Find the electric field at point A (which lies outside both spheres) and at point B (which lies in the gap between the spheres). You need to describe both the magnitude and the direction of the field. For the direction, indicate it in your diagram. (b) [2] What is the potential difference between the two shells? Which shell has the higher potential? (c) [2] From the potential difference, calculate the capacitance. (d) [2] What is the total energy stored in this capacitor? (e) [2]Next, we connect the two shells with a wire that has resistance R. How long does it take for the charge on the outer shell to decrease to Q/2? +Q -Q Xtu Xhz