Aproton (+1.6x 10 c) moves 10 cm along the direction of an electric field of strength 3.0 nic the electrical potential difference between the proton's initial and ending points is: a) 4.8 x 10 d) 30 v v c) 0.033v b) 030 v. e) zero 23. what is the electric potential at the center of conducting spherical shell with charge q = 15 nc and radius 50 cm? let the potential to be zero at infinity a) 5.0x10 v b) 27x10'v c)5.0x10' v d) 2.7x10v e)50x10' v 24. move a point charge from a position a to another position b in an electric field. the minimum work needs to be done is determined by a) path of the motion c) the amount of charge e) both c and d b) difference of electric fields at a and b d) potential difference between a and b 25. a capacitor, an ammeter and a switch are connected in series to a battery. after the switch is closed, how many coulombs of charge would pass through the ammeter? (c = 29.0 μf and v-120 volts.) 26. which of the following is true about a capacitor connected to a given potential difference? a) a capacitor with larger capacitance has larger energy storage b) a capacitor with smaller capacitance has larger energy storage c) the energy storage does not depend on the capacitance d) the above three are all possible e) none of the above is true 27. a capacitor is composed by two flat parallel plates, each with an area of a-10.3cm2. the distance between the plates is d=630mm. the left 1 3 of the capacitor is filled with one material with dielectric constant x,-6, and the right 2/3 is filled with another material with dielectric constant x2=18. the capacitance is a) 248 pf b) 289 pf c)578 pf