How do you estimate the amount of electric charge on 2 point electrodes using th

Question

How do you estimate the amount of electric charge on 2 point electrodes using the accumulated data. I know that you have to use E=k*Q/r^2, and then rearrange to find Q which is the electrical potential. This is a lab report so we drew out the electrical field lines and equipotential lines so we need to use that data but how do I know which areas to select for E, which equals the change of volts over the change of the diatance and also which do i select to be R. Do i measure from charge to charge or just the point that I measure my E from. Thanks.

Explanation / Answer

The electric field of a point charge is given by:

E = k Q/r^2

where, k is the constant equal to 9 x 10^9 ; Q is the charge(not the potential as u stated) and r is the distance between the point charge and the point where field has to be determined.

For equipotential lines, potential at any point is:

V = k Q/r

For calculating the electric field between two potential point:

E = (V2 - V1)/d

So once u calculate the potentials at two different point you can calculated the field.

d is the distance of the point here.

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