This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A farsighted boy has a near point at 2.3 m and requires eyeglasses to correct his vision. Corrective ... (Read 103 times)

bobbie

  • Hero Member
  • *****
  • Posts: 592
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?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

sultansheikh

  • Sr. Member
  • ****
  • Posts: 335
Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

(a) 153 kV (b) zero


bobbie

  • Member
  • Posts: 592
Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

parshano

  • Member
  • Posts: 333
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

Did you know?

The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

Did you know?

The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Development of an atherosclerotic plaque that progressively narrows the lumen of an artery to the po Development of an atherosclerotic plaque that progressively narrows the lumen of an artery to the po
This modified model of Easton’s systems theory puts government decision makers as the source of pol This modified model of Easton’s systems theory puts government decision makers as the source of pol
The correct beginning position for the patient’s feet and crutches (tripod position). The correct beginning position for the patient’s feet and crutches (tripod position).
Correct wrist position while performing compression. A. Correct wrist position for compression ... Correct wrist position while performing compression. A. Correct wrist position for compression ...
Two-point discrimination Two-point discrimination
E chart for testing distant vision E chart for testing distant vision
Video: Audiology

For a complete list of videos, visit our video library