1. Two charges Ql=+5nC and Q2=7nC are separated by 8 cm. Calculate the electric potential at point A. Refer to the gure Q, odd. to the right. 2. A research Van de Graaf generator has a 2.50 mm diameter 6cm sphere with a charge of 6.00 1.10 on it. A . A. What is the potential near its surface? 2cm B. At what distance from its center is the potential 1.50 MV? 9 Activity 2: Electric Potential Energy 1. Twopoint charges 01 = 4.5 110 and 02 = 8.5 110 are initially very far apart. They are then brought together, with a final separation of 3.5 mm. How much work does it take to bring them together? 2. An electron is accelerated from rest through a potential difference of 15V. What is the change in electric potential energy of the electron? 3. In nuclear ssion, a nucleus splits roughly in half. A. What is the potential 4.00 X 10-14m from a fragment that has 50 protons in it? (p=+1.602x10719 C) B. What is the potential energy of a similarly charged fragment at this distance? Activity 3: Electric Potential Demonstration Showing potential energy differences for the earth's gravitational eld can be shown visually. Showing electrical potential (energy) difference is harder to visually show and understand. Use the gravity analogy to establish the electrical potential difference concept. (a) Drop an object (ex: baseball) from rest from 20 (5) cm above a pie tin on spacers. Observe. m (b) Reposition the pie tin and spacers to a different location and again drop the ball from 20 cm. )3 Observe. (c) Drop the same ball onto pie tin 2, but from 100 n... \"Ln-_... \"z... 4:... n ......A .L