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Physics-Please help with formula

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If I have an electric field around a charged object that is 2.95 x 10^6 N/C at a distance of 0.400m, how would I find the charge on the object?

If you could just direct me with a formula-then I'll do it and check back with my answer-Thank you for you help

  • Physics-Please help with formula -

    Look up Gauss's law

  • Physics-Please help with formula -

    http://hyperphysics.phy-astr.gsu.edu/hbase/electric/gaulaw.html

  • Physics-Please help with formula -

    Do it with a sphere with charge at the center and a radius of 0.400 m

    Note - Surface area of sphere = (4/3) pi r^2

  • Physics-Please help with formula -

    Oh wow, look at this:

    http://academicearth.org/lectures/electric-flux-and-gauss-law

  • Physics-Please help with formula -

    I took that course in that room in 1957 !

  • surface area error -

    area = 4 pi r^2

  • Physics-Please help with formula -

    Thanks for your assistance-I'm not sure still how to set it up but I'm going to go to those webiste and investigate it-

  • Physics-Please help with formula -

    The idea is that for a sphere the field is constant over the surface if the charge is considered at the center.
    Therefore E is proportional to charge/(4 pi r^2)

  • Physics-Please help with formula -

    Electric field

    To help visualize how a charge, or a collection of charges, influences the region around it, the concept of an electric field is used. The electric field E is analogous to g, which we called the acceleration due to gravity but which is really the gravitational field. Everything we learned about gravity, and how masses respond to gravitational forces, can help us understand how electric charges respond to electric forces.

    The electric field a distance r away from a point charge Q is given by:

    Electric field from a point charge : E = k Q / r2

    The electric field from a positive charge points away from the charge; the electric field from a negative charge points toward the charge. Like the electric force, the electric field E is a vector. If the electric field at a particular point is known, the force a charge q experiences when it is placed at that point is given by :

    F = qE

    If q is positive, the force is in the same direction as the field; if q is negative, the force is in the opposite direction as the field.

  • Physics-Please help with formula -

    k = 1/(4 pi eo)
    = 9 * 10^9 N m^2/C^2

  • Physics-Please help with formula -

    Would I use this: E=kQ/r^2
    and then I rearrange it and I have-Q=(2.95 *10^6N/C)(0.400m)^2/(8.988 * 10^9n*m^2/C^2)
    =5.25E13
    Is that even close?

  • Physics-Please help with formula -

    3*10^6 * .16 / 10^10 = .5 * 10^-4

  • Physics-Please help with formula -

    10^6/10^9 = 10^-3, I suspect you added

  • Physics-Please help with formula -

    Note - I only carried one significant figure, doing in my head

  • Physics-Please help with formula -

    Get it ?

  • Physics-Please help with formula -

    Thanks-I think I'm beginning to get it-we just started this in class yesterday and I was trying to do the work due next week-thanks for your patience and explanations-I really appreciate it

  • Physics-Please help with formula -

    Great, good luck !

  • Physics-Please help with formula -

    Thank you very much!!

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