Physics,Science

Two point charges Q1 = 10µc and Q2 = -2µc are arranged along the x-axis at x
= 0 and x =4m respectively. Find the positions along the x-axis where v = 0

  1. 👍 0
  2. 👎 0
  3. 👁 101
asked by Mike
  1. Potential is kQ/r
    testing three cases: to the left of Q1, to the right of Q2, and inbetween.
    : to the left (x<0)
    V=k*10/x-k2/(4+x)
    or 2x=10(4+x)
    x=-40/8=-5m
    : in between
    V=k10/x-2k/(4-x) or
    0=40-x-2x or x=40/3 which is not in between the points.
    : to the right
    V=10k/(x)-2k/((x-4) or
    10x-40=2x
    8x=40 or x=5m

  2. check my work.

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    Two point charges of +30μC and -10μC are separated by a distance of 10cm. What is the magnitude of electric field due to these charges at a point midway between them? (k = 9 × 109 N · m2/C2)

    asked by mike on September 10, 2015
  2. physics

    Two point charges lie on the x axis. A charge of 6.2μC is at the origin, and a charge of -9.5μC is at x=10.0cm. What is the net electric field at (a) x=−4.0cm and at (b) x=+4.0cm?

    asked by afton on January 30, 2014
  3. physics

    three point charges are placed at the following points on the x-axis: +2µC at x=0, -3µC at x=40 cm, -5µC at x=120 cm. Find the force (a) on the -3µC charge (b)on the -5µC charge.

    asked by Joanna Luz on January 24, 2011
  4. Physics

    A point charge Q1=-2µC is located at x=0, and a point charge Q2=-8µC is placed at on the x -axis of a cartesian coordinate system.The goal of this problem is to determine the electric field,E(x)=E(x)x^ , at various points along

    asked by Anonymous on February 25, 2013
  5. Physics

    Three point charges are arranged along the x axis: q1 = −4.43 nC at x1 = 199 mm, q2 = 2.33 nC at x2 = -302 mm, and a positive charge q3 at the origin. What is the value of q3 if the net force on this point charge has magnitude

    asked by Julia on February 16, 2008
  6. Physics

    A point charge Q1=-2µC is located at x=0, and a point charge Q2=-8µC is placed at on the x -axis of a cartesian coordinate system.The goal of this problem is to determine the electric field,E(x)=E(x)x^ , at various points along

    asked by Anonymous on February 27, 2013
  7. physics

    Two point charges q1 = q2 = 2μC are fixed at x1 = + 3 and x2 = – 3. A third particle of mass 1 g and charge q3 = – 4 μC are released from rest at y = 4.0. Find the speed of the particle as it reaches the origin. q1= q q2= -q

    asked by sophie moagi on August 12, 2015
  8. physics

    Three point charges are arranged along the x-axis. Charge q1 = +2.75 µC is at the origin, and charge q2 = -5.25 µC is at x = 0.220 m. Charge q3 = -6.50 µC. Where is q3 located if the net force on q1 is 7.50 N in the

    asked by figo on January 27, 2013
  9. physics

    Three point charges are arranged along the x-axis. Charge q 1 = +3.00 ìC is at the origin, and charge q 2 = -5.00 ìC is at x = 0.200 m . Charge q 3 = +8.00 ìC . Where is q 3 located if the net force on q 1 is 7.00 N in the −x

    asked by Anonymous on February 4, 2015
  10. Phyiscs

    Three point charges are arranged along the x-axis. Charge q1 = +2.75 µC is at the origin, and charge q2 = -6.00 µC is at x = 0.220 m. Charge q3 = -7.00 µC. Where is q3 located if the net force on q1 is 6.75 N in the

    asked by Anonymous on February 1, 2018

More Similar Questions