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Author Question: A farsighted boy has a near point at 2.3 m and requires eyeglasses to correct his vision. Corrective ... (Read 97 times)

bobbie

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on: Jul 29, 2018
A farsighted boy has a near point at 2.3 m and requires eyeglasses to correct his vision. Corrective lenses are available in increments in power of 0.25 diopters.
 
  The eyeglasses should have lenses of the lowest power for which the near point is no further than 25 cm. The correct choice of lens power for eyeglasses, in diopters, is: A) +3.75
  B) +3.50
  C) +3.25
  D) +4.00
  E) +4.25

Question 2

Four equal +6.00-C point charges are placed at the corners of a square 2.00 m on each side. (k = 1/40 = 8.99  109 N  m2/C2)
 
  (a) What is the electric potential (relative to infinity) due to these charges at the center of this square?
  (b) What is the magnitude of the electric field due to these charges at the center of the square?


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sultansheikh

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

(a) 153 kV (b) zero


bobbie

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Reply 2 on: Jul 29, 2018
Gracias!

ricroger

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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