ooo Verizon 12:08 PM usq45tx.theexperta.com Hoe Chapter 7. Electric Potential Be

Question

ooo Verizon 12:08 PM usq45tx.theexperta.com Hoe Chapter 7. Electric Potential Begin Date: 8/31/2017 12:01:00 AM-Due Date: 9/182017 900:00 AM Date: 918/2017 9.00:00 AM (10%) Problem 6: Consider the arrangement of three point charges in a right triangle shown in the figure, which have charges q1-7.5pC, 92-"89pC, and 93-35pCThe distance between 1 and g is 42 cm and the distance between 42 and 43 is 76 cm. Randomized Variables 1 75 HC 92 =-89 SiC ted 3-35 C ·42cm ted 50% Part (a) How much potential energy, in Joules.is stored in this configuration od charges? -140.91 ODeees Radians - 50% Part (b) Now assume that q1 and q2 are fixed in space at the locations indicates and q3 is brought into it's position from infinity. What is the change in potential energy of system, in joules, during this process? All content 2017 Expert

Explanation / Answer

part a) for the energy stored in this configuration

Energy stored between two charges = k * q1 * q2/d

total potential energy stored = 9 *10^9 * 10^-12 * (7.5 * (-89)/0.42 - 89 * 35/.76 + 7.5 * 35/sqrt(0.42^2 + 0.76^2))

total potential energy stored = -48.5 J

part b)

for the change in potential energy

change in potential energy during this process = final energy - initial energy

change in potential energy during this process = 9 *10^9 * 10^-12 * 7.5 * 35/sqrt(0.42^2 + 0.76^2) - 9 *10^9 * 10^-12 * (7.5 * (-89)/0.42 - 89 * 35/.76 + 7.5 * 35/sqrt(0.42^2 + 0.76^2))

change in potential energy during this process = 51.2 J

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