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You’re 1.5 m from a charge distribution whose size is much less than 1 m. You measure an electric field strength of 282 N/C. You move to a distance of 2.0 m, and the field strength becomes 119 N/C. What’s the net charge of the distribution? (Hint: Don’t try to calculate the charge. Determine instead how the field decreases with distance, and from that infer the charge.)

I found another similar thread that was closed, and I still had questions.

https://www.physicsforums.com/showthread.php?t=342378

In terms of finding the net charge, I am slightly confused on how to proceed if it's unnecessary to calculate the charge itself. I have tried, though, and am not getting the correct solution. The answer is 0 from my textbook if anyone is interested, but I can't seem to come up with any mathematical explanation for the answer. From the linked thread, the last person comments on monopoles, dipoles, etc. I don't quite understand how that would allow us to determine the exact net charge given the data from the question. Any help would be greatly appreciated!