physics

posted by .

PLEASE HELP!! I HAVE A TEST TOMORROW!!

if Q=30 uC, q=5.0 uC, and d=30cm, what is the magnitude of the electrostatic force on q in N?

(Ke= 8.99 x 10^9 Nm^2/C^2)
(uC= micro coulombs)
(u= 10^-6)

a. 15
b. 23
c. zero
d. 7.5
e 38

i don't know where to start with this problem. i don't even have a formula if there is one.

  • physics -

    Look up Coulombs law.

    http://en.wikipedia.org/wiki/Coulomb%27s_law

  • physics -

    F = k |Q q|/d^2 Coulomb's Law

    k = 9*10^9 Nm^2/C^2

    here
    F = 9*10^9 (30^10^-6)(5*10^-6)/(0.30)^2
    = 1350 *10^-3/(9*10^-2)
    = 150*10^-1
    =15 N
    1350

  • physics -

    i left out an important drawing, but i cant get it to copy correctly.

    '''''''d''''''''''''''' 2d
    O<--->O<--------->O
    Q'''''''' q'''''''''''''''' 2Q

  • physics -

    i used the ''''''''' to hold the spaces

  • physics -

    when i do this problem i keep getting 1.49*10^13 does anyone know where i am going wrong K (30*5)/.3^2. Please email me at burtonjoe72@gmail thx

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    PLEASE HELP!! I HAVE A TEST TOMORROW!! i just posted this problem but a very important drawing was left out! if Q=30 uC, q=5.0 uC, and d=30cm, what is the magnitude of the electrostatic force on q in N?
  2. physics

    sorry! trying to get the drawing correct! PLEASE HELP!! I HAVE A TEST TOMORROW!! i just posted this problem but a very important drawing was left out! if Q=30 uC, q=5.0 uC, and d=30cm, what is the magnitude of the electrostatic force …
  3. physics2

    A charge of -6.5 micro-Coulombs is placed at the origin of a coordinate system. Another charge of -7.6 micro-Coulombs is placed at x = +0.29 m, y = +0.17 m. A third charge of +14 micro-Coulombs is placed at x = -0.29 m, y = 0 m. What …
  4. Physics please help

    What is the potential halfway between two point charges spaced 1 mm apart if q1=10 micro coulombs and q2= -5 micro coulombs?
  5. physics

    A sphere has a radius of 0.20 meters and has a uniform surface charge density equal to 6.3 micro coulombs per meter squared. A second point charge has a magnitude of 0.58 micro coulombs and is 0.61 meters away from the center of the …
  6. physics

    What is the force exerted on 40 micro coulombs by 20 micro coulombs?
  7. physics

    Calculate the magnitude and direction of the Coulomb force on each of the three charges connected in series: 1st - 6 micro Coulombs (positive charge) 2nd - 1.5 micro Coulombs (positive charge) 3dr - 2 micro Coulombs (negative charge) …
  8. physics

    Calculate the magnitude and direction of the Coulomb force on each of the three charges connected in series: 1st - 6 micro Coulombs (positive charge) 2nd - 1.5 micro Coulombs (positive charge) 3dr - 2 micro Coulombs (negative charge) …
  9. physics 2

    A charge of -6.8 micro-Coulombs is placed at x = 0, y = 0. A charge of -18.5 micro-Coulombs is placed at x = 0, y = +37 cm. Another charge of -12.9 micro-Coulombs is placed at x = +17 cm, y = 0 cm. What is the angle the total electric …
  10. Physics

    Calculate the coulomb force on q. They are all in a straight line q1, q2,q3. Q1:1.05 micro coulombs Q2:5.51 micro coulombs Q3:-2.15 micro coulombs The distance, r1, between q1 and q2 is 20.1cm. The distance, r2, between q2 and q3 is …

More Similar Questions