Question

10.·Two point charges of o.3m. What is the potential energy of this 2-el a. +0.9 b, values +4 μ C and . 4.4pc. respect tively, are separated +0.5 e. +1.7J 11. *A point charge of +3,0 μ C is located at the origin of a coordinate sylem an second point charge of-9.0 μ C is at x-1.00 m. x 0.50 m point? a. -5.4x10 v b. 11x1o v c. 16x104 v d. -11x10 v What is the electric potential at the 12. *An electro n 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? b. -44x10-20J c. 22.2x10-20 J d. 880x10-20 J e. Zero xists within a conducting wire, which of the tric 13. When an electric current following statements describes the condition of any accompanying elee 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. placed in a uniform electric field E that makes an angle θ 34° with the horizontal. The opposite end of the string is attached to a wall and the sphere is in static equilibrium when the string is horizontal as in the figure shown below. a. Find the magnitude of the electric field. b. Find the tension in the string 14. *A small sphere of charge q-+67 pC and mass m = 5.3 g is attached to a light string and

Answer 1

10. PE = k q1 q2 / r

PE = (9 x 10^9) (4 x 10^-6)(4.4 x 10^-6)/0.3

PE = 0.5 J

Ans(c)

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^-6/0.5)

V = - 11 x 10^4 Volt

Ans(d)

12. force is perpendicular to displacement.

so Work done = 0

Ans(e)