tiD 259036 Monday, October 23|4:18 PM on FlipltPhysics Physics 4B: EM and Heat,

Question

tiD 259036 Monday, October 23|4:18 PM on FlipltPhysics Physics 4B: EM and Heat, F2017 macmillan learning California State University, Fresno Unit 12: Prelecture / Checkpoint /Homework Homework: HW9 Of Ch22&23 Deadline: 100% until Monday, October 23 at 11:59 PM Tipler6 23.P.065 1 2 3 Three point charges are on the x axis: q1 is at the origin, q2 fs at x-.2 m, and qi is at x.57 m. Find the electrotatic potential energy of this system of charges for the following charge values. (Assume the potential energy is zero when the charges are very far from each other.) mJ Submit You currently have 0 submissions for this question. Only 10 submission are allowed. You can make 10 more submissions for this question. mJ Submit You curentiy hom Oin uestion Only 10 submision ore allowed. can make 10 more submissions for this question. 23 MacBook Air

Explanation / Answer

1)

x12 = distance between q1 and q2 = 2 m

x13 = distance between q1 and q3 = 5.7 m

x23 = distance between q2 and q3 = 5.7 - 2 = 3.7 m

U = electric potential energy

U = k q1 q2/x12 + k q1 q3/x13 + k q2 q3/x23

U = (9 x 109) (4 x 10-6)2 (1/2 + 1/5.7 + 1/3.7)

U = 0.14 J

b)

U = k q1 q2/x12 + k q1 q3/x13 + k q2 q3/x23

U = (9 x 109) ((4 x 10-6)2/2 - (4 x 10-6)2/5.7 - (4 x 10-6)2/3.7) = 0.0078 J

c)

U = k q1 q2/x12 + k q1 q3/x13 + k q2 q3/x23

U = (9 x 109)  ((2.9 x 10-6)2/2 - (2.9 x 10-6)2/5.7 - (2.9 x 10-6)2/3.7) = 0.0078 J

U = 0.0041 J

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