BOX IN FINAL ANSWERS Exercise 22.26 Part A Constants A very large, horizontal, n

Question

BOX IN FINAL ANSWERS

Exercise 22.26 Part A Constants A very large, horizontal, nonconducting sheet of charge has uniform charge per unit area 9.00 x 10-5 C/mº. A small sphere of mass m = 4.00 x 10-" kg and charge q is placed 3.00 cm above the sheet of charge and then released from rest. If the sphere is to remain motionless when it is released, what must be the value of q? Express your answer with the appropriate units. :H 6 + O2? q= 0.3 nC Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B What is qif the sphere is released 1.50 cm above the sheet? Express your answer with the appropriate units. !uÅ 6 + O E) ? q= Value Units

Explanation / Answer

(A) Fnet = Fe - Fg = 0

Fe = Fg

and Fe = q E and Fg = m g

field due to sheet,

E = sigma / 2 e0

q (sigma / 2 e0) = m g

q (9 x 10^-6 / (2 x 8.854 x 10^-12) = 4 x 10^-6 x 9.8

q = 77.1 x 10^-12 C ....Ans
  
Or 77.1 pC

(B ) q is independent of distance from sheet.

so q = 77.1 pC

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