MasteringPhysics: H24 - Mozilla Firefox https://session.masteringphysics.com/myc

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MasteringPhysics: H24 - Mozilla Firefox https://session.masteringphysics.com/myct/itemView?assignmentProblem ID=84579561 HW24 Problem 24.28 e previous | 3 of 13 next Problem 24.28 Part A A thin, horizontal, 17-cm-diameter copper plate is charged to 4.2 nC. Assume that the electrons are uniformly distributed on the surface What is the strength of the electric field 0.1 Imm above the center of the top surface of the plate? Express your answer to two significant figures and include the appropriate units. E1.2.10 Submit Incorrect; Try Again; 3 attempts remaining Part B What is the direction of the electric field 0.1 mm above the center of the top surface of the plate? away from the plate toward the plate Submit My Answers Give Up Correct 4:41 PM O Type here to search 40) 16-Sep-17

Explanation / Answer

(C) field at the plate's center of mass

E = 0 (from symmetry )

(D) field just above the center of plate,

E = ( k Q / (d^2 + R^2)) (d / sqrt(d^2 + R^2))

E = k Q d / (R^2 + d^2)^(3/2)

E = (9 x 10^9) (4.2 x 10^-9) (0.0001) / [ (0.0001)^2 + (0.085)^2]^(3/2)

E = 6.16 N/C

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