SHOW ALL WORK 1. What is the potential energy for those two charges? 2. What is

Question

SHOW ALL WORK
1. What is the potential energy for those two charges? 2. What is the potential energy if a third point charge q= -8.4nC is placed at point a? 3. What is the potential energy if a third point charge q= -8.4nC is placed at point b? 13. two charges, O-16t and O-16uC. Calculate (15 points) 1. What is the potential Energy for those two charges? 2. What is the potential energy if a third point charge 1. What is the potential energy if a third point charge 1. What is the potential energy if a third point charge -B.4 nC is placed at point a? -8.4 nC is placed at point b? q-8.4 nC is placed at point c? 8.00 cm 8.00 cm 400+400+400 4.00--4.00-40o

Explanation / Answer

U = k Q1 Q2 / r

1) U = (9 x 10^-9 x 16 x 10^-6 x -16 x 10^-6) / (8 x 10^2)

U = -2.88 x 10^-21 J

2) U = (9 x 10^-9 x 16 x 10^-6 x -8.4 x 10^-6) / (4 x 10^-2) + (9 x 10^-9 x -16 x 10^-6 x -8.4 x 10^-6) / (12 x 10^-2)

U = (-3.02 x 10^-17) + (1 x 10^-17)

U = -2.02 x 10^-17 J

3) U =  (9 x 10^-9 x 16 x 10^-6 x -8.4 x 10^-6) /  (4 x 10^-2) + (9 x 10^-9 x -16 x 10^-6 x -8.4 x 10^-6) / (4 x 10^-2)

U = (-3.02 x 10^-17) + (3.02 x 10^-17)

U = 0

4) U =  (9 x 10^-9 x 16 x 10^-6 x -8.4 x 10^-6) /  (8 x 10^-2) + (9 x 10^-9 x -16 x 10^-6 x -8.4 x 10^-6) / (8 x 10^-2)

U = 0

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