Part A Answers : ?9.6?10 ?4 N ; 2.1?10 ?7 N ; 3.0?10 ?7 N are all INCORRECT Part

Question

Part A Answers : ?9.6?10?4 N ; 2.1?10?7 N ; 3.0?10?7 N are all INCORRECT

Part B Answers : ? = 90° ; -90° ; 270° ; -270° counterclockwise from the positive x-axis are all INCORRECT

Problem 20.50 shows five electric charges. Four charges with the magnitude of the charge 2.0 nC fom a square with the size a 1.5 cm. Positive 2.0 nC 2.0 nC charge with the magnitude of g 7.5 nC is placed in the center of the square. 2.0 nC 2.0 nC Part A What is the magnitude of the force on the 7.5 nC charge in the middle of the figure due to the four other charges? Express your answer to two significant figures and include the appropriate units. ANSWER on 3.0.10 TN incorrect; Try Again; 5 attempts remaining Part B What is the direction of the force on the 7.5 nC charge in the middle of the figure due to the four other charges? ANSWER 0 270 o counterclockwise from the positive z-axis incorrect; Try Again; 4 attempts remaining

Explanation / Answer

r = 0.75*sqrt(2) = 1.06 cm

F due to 2nC = 9*10^9*7.5*2*10^-18 / 0.0106^2 = 1.2*10^-3 N

F1 (due to two opposite charges) = 2.4*10^-3 N

F2 = 2.4*10^-3 N

Fnet (on x axis, because y axis cancel out due to opposite direction) = 2*2.4*10^-3*Cos45 = 3.39*10^-3 N

Direction = 180 degree counterclockwise with the positive x axis

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