4. [1pt] Two charges, +q and -q, are located in the x-y plane at points (0,+d/2)

Question

4. [1pt]
Two charges, +q and -q, are located in the x-y plane at points (0,+d/2) and (0,-d/2), respectively. Calculate the magnitude of the electric field at point P with the superposition principle.




Data: q=20.0 nanoCoulombs,
d=4.20mm and P at
x=84.0mm.

Correct, computer gets: 1.273E+03 N/C (( i solved this ! its correct ))

pls solve number 5 !
5. [1pt]
In the previous problem, you can get an approximate answer for the electric field at point P by using the electric dipole approximation which is valid for the limit x>>d. Calculate the electric field at point P with this approximation and the same values for Q, d and x as in the previous problem.

Explanation / Answer

E due to a dipole= 3KP.x/x3x - KP/ x3

x = unit vector along the position where we have to evaluate field.

R= distance of the point from the origin.

P = Dipole moment= q*D

Here, P = qd j

Put the values and answer follows. :)

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