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Can an Electric Field run in multiple directions infront of one point charge?
I'm doing a physics project and i know that voltage increases in the direction of an electric field. but i've been analyzing data i got doing an experiment using 2 electrodes and carbon paper, plotting points every 1.6cm and recording the voltage. on the beginning of the apparatus is a single point charge and at the other end is nothing. Now, as i go from left to right i'm getting numbers that decrease, then increase, and decrease again (voltage i'm talking about). For example at 1.6 cm the V is .798, at 3.2 its .768V, 4.8cm and .701 is the voltage, then .814V @ 6.3cm, 0.882 @ 7.9, and finally, .725V @ 9.55cm. This has to be an error reading the voltmeter correct? Because I though electric field and distance were inversely proportional. Please help me, thanks.
Hi,
The field strength should drop off with distance, so when you're 5x further away, the field strength should be 1/25 as strong.
That being said, the change in voltage should be
V2- V1 = Int (E dL)
so one possibility is that the field strength is varying at the same rate as the distance, so the difference in voltage is small. I'd crank up your field source to eliminate any minute variation and see what you get.
Another thing to think about is the error of your multimeter, make sure that you're able to measure the quantities that you expect to find.
Hope that helps,
Matt
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