Question

A thin plastic rod of length 2.7 m is rubbed all over with wool, and acquires a charge of 72 nC, distributed uniformly over i

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Answer #1

Linear charge density, lambda = 72/2.7 = 26.67 nC/m

A)

Electric field, Ex = (9 x 10^9)(26.67 x 10^-9/0.12)(2 x 2.7/2)/sqrt((2.7/2)^2 + 0.12^2)

Ex = 3984.79 N/C

B)

Electric field, E = 2 x 9 x 10^9 x 26.67 x 10^-9/0.12 = 4000.5 N/C

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