Q1 = 0.000004 d1 = -0.01 m(adsbygoogle = window.adsbygoogle || []).push({});

Q2 = -0.000001 d2 = 0.03 m

Now using that information, I found that the electric field at x = 0.0 m is3.7 x 10^8 N/C

now i need to find out at which point the electric field is zero.

I made a program to guess and check for me, and what I do is:

[k * 0.000004] / (x+d1)^2 = field 1

[k * -0.00001] / (x-d2)^2 = field 2

then field 1 - field 2 = net electric field at x

The calculations are not wrong because when i enter 0, i get the correct answer, and when i plug in other numbers (1, 4, 5) that i have worked out, it gives me the correct answer also.

My problem is that it seems that there will never be an electric field of zero, it just gets smaller and smaller.

For example, at a point of 1 million meters, the net electrical field is4.493999982024E-08

at a point of 100 million meters, the net electrical field is4.4939999998202E-12

so it just gets smaller and smaller, but will it ever get to zero? or am i doing somethign wrong?

Thanks

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# Homework Help: Determine a point where the electric field is zero

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