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Author Question: Identical point charges (+20 mC) are placed at the corners of an equilateral triangle with sides of ... (Read 272 times)

karen

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on: Jul 28, 2018
Identical point charges (+20 mC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 mC from infinity to the midpoint of one side of the triangle?
 a. 26 J
  b. 16 J
  c. 23 J
  d. 21 J
  e. 12 J

Question 2

A charge of +3.0 mC is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25mC from infinity to the center of the circle?
 a. 5.4 J
  b. 3.4 J
  c. 4.3 J
  d. 2.7 J
  e. 6.8 J


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juiceman1987

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Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

B


karen

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Reply 2 on: Jul 28, 2018
Gracias!

cpetit11

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Reply 3 on: Yesterday
Excellent

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