الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Lectures in General Physics
Solution
V = ∑ V n = V 1 + V 2
V =
⎛
K
⎜
⎝
q
r
−
q
r
⎞ r
⎟ = Kq
⎠
− r
2 1
⎟
1 2
r2
r1
When r>>2a,
r 2 - r 1 ≅ 2acosθ and r 1 r 2 ≅ r 2 ,
2a
cosθ p cosθ
V = Kq K
2 =
2 (5.19)
r r
where p is the dipole momentum
Note that V = 0 when θ=90 o but V has the maximum positive value when
θ=0 o and V has the maximum negative value when θ=180 o .
Dr. Hazem Falah Sakeek