# Solved >   36. Two point charges are placed along:2101793 …

36. Two point charges are placed along a horizontal axis with the following values and positions: +3.0 µC at x = 0 cm and -7.0 µC at x = 20 cm. At what point along the x axis is the electric field zero?

A. 8.0 cm

B. -44 cm

C. -69 cm

D. -38 cm

37. A proton initially moves left to right long the x axis at a speed of 2.00 ´ 103 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.200 m before coming to rest. What acceleration magnitude does the proton experience?

A. 6.67 ´ 103 m/s2

B. 1.00 ´ 107 m/s2

C. 9.33 ´ 109 m/s2

D. 2.67 ´ 1011m/s2

38. A proton initially moves left to right long the x axis at a speed of 2.00 ´ 103 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.200 m before coming to rest. If the proton’s mass and charge are 1.67 ´ 10-27 kg and 1.60 ´ 10-19 C respectively, what is the magnitude of the electric field?

A. 28.3 N/C

B. 13.9 N/C

C. 0.104 N/C

D. 0.038 N/C

39. Two charges, +Q and –Q, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point?

A. Vector EA

B. Vector EB

C. Vector EC

D. The electric field at that point is zero.

40. A charge of +2 C is at the origin. When charge Q is placed at 2 m along the positive x axis, the electric field at 2 m along the negative x axis becomes zero. What is the value of Q?

A. -3 C

B. -6 C

C. -7 C

D. -8 C

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