Wednesday Homework Problem 3.4 A +2nC point charge is at the point (-1cm, -2cm,

Question

Wednesday Homework Problem 3.4 A +2nC point charge is at the point (-1cm, -2cm, 3cm). Compute the electric field at a point P at (-2cm, -6cm, 2cm). Select one of the Following: (a) (-2.4 x 1038,-9.4 x 10a 8,-2.4 x 1038) (b) (-2.4 x 10 8,-9.4 x 1058,-2.4 x 10 8) (c) (2.4 x 1038,9.4 x 1038,2.4 x 10a8) (d) (2.4 x 1058,9.4 x 1058,2.4 x 1038) (e) (-2.4 x 10 8,9,4 x 1048,-2.4 x 10 8) Wednesday Homework Problem 3.5 If the magnitude of the electric field of an infinite plane of charge at a point 10.0m from the plane is IEI 100.0 what is the surface charge density o? Select One of the Following (a) 3.12 x 10 7C/m2 (b) 1.77 x 10 3C/m2 (c) 8.85 x 10 10 C/m (d) 1.77 x 10 9C/m2 (e) 0 Wednesday Homework Problem 3.6 The peak linear charge density of a lightning bolt is 3mC/m 3 x 10 SC/m. Model the lightning bolt as a single infinite straight uniform linear charge. Dry air undergoes dielectric breakdown and sparks at an electric field of 3 x 1068. At what maximum distance from the lightning bolt does a field of 3 x 10% exist? Select one of the Following: (a) 7.2m (b) 18m (c) 24m (d) 32m (e) 3.6m

Explanation / Answer

3.5)(d) 1.77 x 10^-9 C/m^2 is the correct choice

explanation

we know that

E = sigma/2e0

sigma = E x 2 epsilon0

sigma = 100 x 2 x 8.85 x 10^-12 = 1.77 x 10^-9 C/m^2

(d) 1.77 x 10^-9 C/m^2 is the correct choice

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