Physics

Determine the magnitude and direction of the total electric force on the +q charge by the +Q and -Q charges respectively. it should express and algebraic expression using Q,q,x,d and fundamental constants.

-- I am trying to post a graph but it is not willing to so I will try to explain it --

Q+ is up on the y access ( x = 0 ) and Q- is down the y access ( x = 0 ) , both at equal distances d of the origin. q is to the right of the x access ( y = 0 ) at a distance x from the origin

So I am trying to solve it like this
Net Force = (Force of +Q on q) + ( Force of -Q on q)

using this equation for force (Kq1q2)/r^2

but then we need to find the components right ?

so I thought it is like this

Fnet = sqrt ( Fnet of x components )^2 + (Fnet of y component)^2

but then for the x components , the r in the equation should be x ,, and for the y components the r should be d

am I right ? I feel confused and I think I am wrong :S

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
  1. You are almost right, however, it is easier for me to break up the two forces into vertical and horizontal components.

    well, first, the force on q from Q is kQq/distance^2 at some angle from the horizonal (arc tan d/x)
    the horizontal force is
    a) kqq/distanc^2*cosTheta
    if you calculate the horizontal force component from -Q, it is the same but in a opposite direction, so the net horizontal force is ZERO.

    Vertical forces:
    vertical force from Q (top) is
    kQq/distance^2 * sinTheta in the down direction
    vertical force from -Q (bottom) is the same, and in the down direction.

    so the net force is downward,

    2kQq/(d^2+x^2) * sin (arctan d/x)

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    👤
    bobpursley
  2. Thank you very much :D

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    charge q1=+4.00nc is located at x=0.200m, and q2 =+5.00nc is at x=-0.300 m. what are the magnitude and directionof the net force exerted by these two charges ona negative point charge q3 = -0.600 nc placed at the origin ? I think

  2. physics

    please check: Two point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the resulting electric and gravitational forces between them change? a. 9 b. 3 c. 1/3 d. 1/9 D Two positive charges,

  3. physics (coulombs law)

    a charge +6 C experiences a force of 2mN in +x direction. a)what was the electric field there before charge was placed ? b)describe the force which a -2c charge would experience if it is located at the point in place of the +6c

  4. college physics

    A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C

  1. Physics

    A particle has a charge of +1.5 µC and moves from point A to point B, a distance of 0.18 m. The particle experiences a constant electric force, and its motion is along the line of action of the force. The difference between the

  2. Physics

    Negative charge is distributed uniformly around three-quarters of a circle of radius, a, with the center of curvature at the origin. a) Use integration to find an algebraic expression for the x and y components of the net electric

  3. Physics

    Charge q1 = 7.00 μC is at the origin, and charge q2 = -5.00 μC is on the x-axis, 0.300 m from the origin as shown below. (a) Find the magnitude and direction of the electric field at point P, which has coordinates (0, 0.400) m.

  4. physics

    A charge of -4.50 10-6 C is placed at a point in space where the electric field is directed toward the right and has a magnitude of 9.00 104 N/C. What are the magnitude and direction of the electrostatic force on this charge?

  1. physics

    a particle having a charge of -2.0 x 10^-9 is acted on by a downward electric force of 3.0 x 10^-6 in a uniform electric field. what is the magnitude and direction of the electric force exerted on a proton placed in this field.

  2. physics

    Two spheres are mounted on identical horizontal springs and rest on a frictionless table, as in the drawing. When the spheres are uncharged, the spacing between them is 0.05 m, and the springs are unstrained. When each sphere has

  3. physics- check

    1. three point charges, q1, q2, q3, lie along the x-axis at x = 0,3,5, respectively. Calculate the magnitude and direction of the net electric force on q1 if q1 = +6 x 10^-6 C, q2 = +1.5 X 10^-6 C and q3 = -2.0 x 10^-6 C. my

  4. physics

    a charge +6 C experiences a force of 2mN in +x direction. a)what was the electric field there before charge was placed there? b)describe the force which a -2c charge would experience if it were used in place of the +6 c charge?

View more similar questions or ask a new question.