Exercise 22.26 Constants Part A A very large, horizontal, nonconducting sheet of
ID: 3308828 • Letter: E
Question
Exercise 22.26 Constants Part A A very large, horizontal, nonconducting sheet of charge has uniform charge per unit area 5.00 x 10-6 C/m2. A small sphere of mass m = 4.00 × 10 6 kg and charge q is placed 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. 3.00 crn above the sheet of charge and then released from rest. Value Units Submit Part B What is q if the sphere is released 1.50 cm above the sheet? Express your answer with the appropriate units. Value Units Submit Provide Feedback Next>Explanation / Answer
(A) electric force on charge have to equal to its weight and in upward direction.
field due to sheet, E = sigma / 2 e0 upward
so Fe = q E (q will be +ve)
q (5 x 10^-6) / (2 x 8.854 x 10^-12) = (4 x 10^-6)(9.81)
q = 139 x 10^-12 C or 139 pC
(B) field (or electric force) is independent of distance from sheet.
hence q = 139 x 10^-12 C Or 139 pC
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