Please help: Calculate the electric field at the center of a square 52.5cm on a side if one corner is occupied by a +45uC charge and the other three occupied by -27uC charges.

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Please help: Calculate the electric field at the center of a square 52.5cm on a side if one corner is occupied by a +45uC charge and the other three occupied by -27uC charges.

Mathematics
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sounds like physics bud
but i will help you anyway. you just need to find the NET electric field.
if you want me to help. . .

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Other answers:

Do you know the formula for electric field?
is it E=F(R)/Q ??
\[E= kq/r^2\]
okay. then?
|dw:1340433733455:dw|
does the question say the side length of the square is 52.5cm?
The question say: "at the center of a square 52.5cm on a side if one corner is occupied by a +45uC charge..."
okay, i'm going to assume the "side length" is 52.5cm
okay. i think it is the length.
|dw:1340433904871:dw|
okay.
hmm i think thats it.
you need the length from the corner to the charges. do you know how to find that?
sorry i dont know.
okay, if we have the side length of 52.5cm, to find the diagonal length we multiply this by \[\sqrt{2}\]
can you do that?
52.5 * sqrt of 2 ?
yes = ?
74.24
but why sqrt of 2 ?
because a square is in the form of x^2+y^2=2.. you can look into it later, and just trust me.
okay sure.
haha, k... so that 74.25cm is the diagonal length, we divide this by 2 to give us the corner to center length
its 37.12
okay so now we can use our formula.
okay.
E=(kq)/r^2
our k is 9x10^9 ?
close enough, in physics we typically use 8.99 x 10^9
oh but can we use 9x10^9 ?
we have to calculate each individual electric field. sure, it is close enough.
okay. then our Q is what? our R is 37.12 ?
our q is the charge, there are 4 different charges. +45uC and -27uC, -27uC, -27uC
so we will use the four different charges? one by one?
we will do two separate computations as three of them will be the same (-27uC)
so lets get started
okay sure lets get started
fill this in with what we know: E=(kq)/r^2
or just do it on you're calculator and tell me the two answers
E=(9x10^9) (+45uC)/37.12 ?
close... E=(9x10^9*45E-6)/(37.12)^2 dont forget to square the denominator
and also remember the units for the charge is in micro coulombs
therefore 45E-6
why is the exponent is -6 ?
i just told you, because the units are in uC
that little "u" mean E-6
oh yeah
okay, so what your answer?
then the C means coulombs?
correct
0.00079
you used this? E=(9x10^9*45E-6)/(37.12)^2
yup i did
well i'm afraid that is wrong, you must have typed it in wrong
http://www.wolframalpha.com/input/?i=%28%289x10%5E9%29%2845E-6%29%29%2F%2837.12%29%5E2
let me check
E means exponent right?
k dude, you take way to long. I need to sleep. You should get a value of 293.55 N/C for the +45uC and you should get -176.13 N/C for the -26uC
its -27uC
right, -27uC still the same answer.
i think you should be able to do it from here.. i've been helping you for over an hour.
okay thank you so much.

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