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الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

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Lectures in General Physics

Example 3.5

Find the electric field due to electric dipole shown in figure 3.10 along

x-axis at point p which is a distance r from the origin. then assume

r>>a

Solution

r r r

E p

= E 1

+ E 2

q

E 1 = K

2

( x + a)

q

E 2 = K

2

( x − a)

q

E p = K

2

( x − a)

4ax

E p = Kq

2 2 2

( x − a )

q

( x + a)

-

2

+q

2a

-q

E 2

E 1

1

2

x

p

When x>>a then Figure 3.10

2aq

∴ E =

(3.9)

4πε x3

ο

2a

x

الإجابة لاحظ

النهائية عندما تكون

أكبر كثيرا من المسافة

يتناسب حيث

المجال عكسيا مع

مكعب المسافة.‏

Dr. Hazem Falah Sakeek

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