An insulating spherical shell with inner radius 25.0 cm and outer radius 60.0 cm carries a charge of + 150.0 μC uniformly distributed over its outer surface. Point a is at the center of the shell, point bis on the inner surface and point c is on the outer surface.
Part A) What will a voltmeter read if it is connected between a and b?
Part B) What will a voltmeter read if it is connected between b and c?
Part C) What will a voltmeter read if it is connected between c and infinity?
Part D) What will a voltmeter read if it is connected between a and c?
Part E) Which point is at higher potential, a or b?