Electrostatic field

mohammad.esmaeili · Joined: 05 Aug 2007 Posts: 2

Hi,
As you know there is an electrical field around each electrostatic
charge. I know how to create an electrostatic field. But I have problem
by creating a "variable electrostatic field". Can you give me a guide?

Thanks in Advance

Archived from group: misc>education>science

Guy · Joined: 05 Aug 2007 Posts: 6

The easiest way is to move an electrostatically charge object. Just
wave that charged rod or balloon, and the electrostatic filed will be
variable. This will also create a minute magnetic field, because as we
all know, the electric and magnetic fields are "coupled".

Guy

mohammad.esmaeili@gmail.com wrote:
> Hi,
> As you know there is an electrical field around each electrostatic
> charge. I know how to create an electrostatic field. But I have problem
> by creating a "variable electrostatic field". Can you give me a guide?
>
> Thanks in Advance

mohammad.esmaeili · Joined: 05 Aug 2007 Posts: 2

Thanks for your answer. But as you know, for example,in a capacitor
the electric
field exist between the electrodes(plates), or we can say it is
ristricted there. what I need is an variable electric field like what
we see in a "Van de graaff" (that is limited just from one side).
In the other word, I want to have an electric field with this
specification that I could change its intensity (variable electrostatic

field). for example in the electromagnetic fields, you can change the
field's intensity by changing the current of the coil. So do you have
any idea for the electrostatic fields?

On Jan 2, 1:55 am, "Guy" wrote:
> The easiest way is to move an electrostatically charge object. Just
> wave that charged rod or balloon, and theelectrostaticfiled will be
> variable. This will also create a minute magneticfield, because as we
> all know, the electric and magnetic fields are "coupled".
>
> Guy
>
>
>
> mohammad.esmae...@gmail.com wrote:
> > Hi,
> > As you know there is an electricalfieldaround eachelectrostatic
> > charge. I know how to create anelectrostaticfield. But I have problem
> > by creating a "variableelectrostaticfield". Can you give me a guide?
>
> > Thanks in Advance- Hide quoted text -- Show quoted text -

Guy · Joined: 05 Aug 2007 Posts: 6

So as I understand it, you want something like a Van de Graff generator
that has a voltage that you can control? All (or most) Van de Graff
generators work by slowly charging up, and then discharging, e.g., when
a spark forms.

It might be possible to construct a variable resistor from the Van de
Graff to ground. But be warned that this will be no ordinary resistor.
You would need an incredibly large amount of ohms, and it would have
to hold off thousands of volts.

A simpler way would be to bring up another conductor up "behind" the
sphere that holds the Van de Graff generator's charge. That would
polarize the sphere, and the "front" would contain less charge. By
"front" of the sphere, I am referring to the space where you want to
produce the field.

Or, you could change the speed of the belt. How quickly do you want to
vary the voltage?

Guy
http://faculty.valpo.edu/gvandegr/

mohammad.esmaeili@gmail.com wrote:
> Thanks for your answer...what I need is an variable electric field like what
> we see in a "Van de graaff" (that is limited just from one side).

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