Physics, 02.08.2019 12:00 alisonnn101

What third charge should be placed at x=+26cm so that the total electric field at x=+13.0cm is zero?

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Answer from: masie03

Complete text of the problem:

"Two point charges lie on the x axis. A charge of + 2.20 pC is at the origin, and a charge of − 4.60 pC is atx=−13.0cm.

What third charge should be placed at x=+26cm so that the total electric field at x=+13.0cm is zero?

Express your answer to three significant figures and include appropriate units"

Let's call A the point at x=+13 cm where the total electric field is zero.

First of all, we can calculate the total field generated by the two charges $q_1=2.20~pC=2.2\cdot10^{-9}~C$ and $q_2=-4.6~pC=4.6\cdot10^{-9}~C$ . The two charges have a distance from point A of r_1=13~cm=0.13~m and r_2=26~cm=0.26~m , respectively. The field generated by the positive charge heads towards right in point A, while the one generated by the negative charge heads towards left, so we should consider a sign - on this field. Therefore, the total field generated by charge 1 and 2 in A is

$E_{12}=k_e \frac{q_1}{r_1^2}-k_e \frac{q_2}{r_2^2}=1170.3~V/m - 611.7~V/m=558.6~V/m$

In order to have total net field of zero in point A, the field generated by charge 3 should be equal to this value, and should point towards the left, so it must be a positive charge. So, we have:

$E_3 = E_{12}=558.6~V/m=k_e \frac{q_3}{r_3^2}$
where r_3=0.13~m is the distance of the charge 3 from point A. So we find

$q_3=E_{12} \frac{r_3^2}{k_e}=1.05\cdot 10^-9~C=1.05~pC$

Answer from: Quest

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b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

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which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

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the nec is published by the

a national fire protection association

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b. labeled and listed

explanation:

Answer from: Quest

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explanation:

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What third charge should be placed at x=+26cm so that the total electric field at x=+13.0cm is zero?...

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