e. +1.7J 11, *A point charge of +3.0 C is located at the origin of a coordinate

Question

e. +1.7J 11, *A point charge of +3.0 C is located at the origin of a coordinate system and a secondpoint charge of-9.0 C is at x-1.00 m, what is the electric potential at the x = 0.50 m point? a. -5.4x104 v b. 11x104 v c. 16x104 v d. -11x104 v 12. *An electron moves on a path perpendicular to the direction of a uniform electric field of strength 2.2 N/C. How much work is done on the electron as it moves 20 cm? a. 96.8x10-20 J b. -44x10-20 J c. 22.2x10-20 J d. 880x1020 J e. Zero 13. When an electric current exists within a conducting wire, which of the following statements describes the condition of any accompanying electric field? a. Must be zero. b. Must be parallel to current flow. c. Must be anti-parallel (opposite direction) to current flow. d. Must be perpendicular to current flow.

Explanation / Answer

11. V = k q1 / r1 + k q2 / r2

V = (9 x 10^9 x 3 x 10^-6 / 0.50) + (9 x 10^9 x -9 x 10^-6 / 0.50)

V = - 10.8 x 10^4 V

Ans(D) -11 x 10^4 V

12. force will be along field.

and force is always perpendicular to displacement.

W = F.d = F d cos(theta)

theta = 90 deg , cos90 = 0

W = 0

Ans(e)

13. charge flows in the direction of field.

Ans(b)

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