【物理应用】基于电偶极子的matlab源码GUI

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相距为l的一对等量异号点电荷+q和-q,并且它们到观察点P的距离rl。通常的媒质分子在外电场的作用下可以形成这种电偶极子。电偶极子的特征用电偶极矩(或电矩)p＝lq表示，l和p的方向规定由-q指向+q。电矩p 的国际制单位为C·m(库·米)。微观物理学中常用的单位为德拜(debye)；1德拜＝3.336×10C·m，它相当于典型分子内部核间距离的十分之一(约2×10m)同一个电子的电荷e=1.6×10C的乘积。

电偶极子产生的电场＋q和－q分别在观察点P(r)产生的电位的代数和即电偶极子产生的电位

式中墷只对P点的坐标变量运算。在P点的电场强度为。

外电场中的电偶极子若电偶极子＋q和－q所在点的外电场的电位为V1和V2,则偶极子的位能W=qV1-qV2=q(l·墷)V＝p·墷 V＝-p·Eo,式中Eo为点偶极子所在的外电场强度。

偶极子在外电场中受到平移力 F＝-墷W＝墷(p·Eo)＝(p·墷)Eo。

如果外电场均匀，Eo为常量，则F＝0。偶极子在外电场作用下受到的力矩 T＝-дW／дθ＝pEosinθ或T＝p×Eo，它使电矩p同外电场强度Eo的夹角减小。如果p 同Eo平行，则力矩T＝0。并可看到p的量值也就是电偶极子在单位外电场(Eo=1)下可能受到的最大力矩，故称电矩。

如果点偶极子 p1 处于另一偶极子 p2 产生的电场E2(r)中，则p1的位能即相互作用能为【物理应用】基于电偶极子的matlab源码GUI_matlab 电偶极子

。

电偶极子是电介质理论和原子物理学的重要模型，研究从稳恒到 X光频电磁场作用下电介质的色散和吸收，以及天线的辐射等现象,可以用振荡偶极子poe 【物理应用】基于电偶极子的matlab源码GUI_matlab_02 电偶极子

来表示。

将偶极子概念加以推广，可有多极子，它是含有2个大小相等的点电荷，其中正负各半数，排列成有规律的点阵。在多极子系列中，n＝0时，就是点电荷；n＝1，就是电偶极子；n＝2，称为四极子；n≥2，统称为高阶多极子。

高阶多级子模型应用于核物理，其中最重要的是四极子。任意点电荷集合或任意分布电荷，如果能够用一个球面包围,则球外的电位V可用集中在球心的点多极子系列的合成电位表示，称为电场的多极子展开。

function varargout = dianoujizi(varargin)
% dianoujizi MATLAB code for dianoujizi.fig
%      dianoujizi, by itself, creates a new dianoujizi or raises the existing
%      singleton*.
%
%      H = dianoujizi returns the handle to a new dianoujizi or the handle to
%      the existing singleton*.
%
%      dianoujizi('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in dianoujizi.M with the given input arguments.
%
%      dianoujizi('Property','Value',...) creates a new dianoujizi or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before dianoujizi_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to dianoujizi_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help dianoujizi

% Last Modified by GUIDE v2.5 03-May-2013 20:22:55

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...             %GUI结构
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @dianoujizi_OpeningFcn, ...
                   'gui_OutputFcn',  @dianoujizi_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before dianoujizi is made visible.
function dianoujizi_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to dianoujizi (see VARARGIN)
set(handles.a_edit,'String',2);  %设置默认值为2
set(handles.b_edit,'String',2);  %设置默认值为2



% Choose default command line output for dianoujizi
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes dianoujizi wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = dianoujizi_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;

function a_edit_Callback(hObject, eventdata, handles)
% hObject    handle to a_edit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of a_edit as text
%        str2double(get(hObject,'String')) returns contents of a_edit as a double

% --- Executes during object creation, after setting all properties.
function a_edit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to a_edit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

function b_edit_Callback(hObject, eventdata, handles)
% hObject    handle to b_edit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of b_edit as text
%        str2double(get(hObject,'String')) returns contents of b_edit as a double


% --- Executes during object creation, after setting all properties.
function b_edit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to b_edit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in eped_pushbutton.
function eped_pushbutton_Callback(hObject, eventdata, handles)
% hObject    handle to eped_pushbutton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
a=str2num(get(handles.a_edit,'String'));    %获得默认值
b=str2num(get(handles.b_edit,'String'));
x=-8:0.8:8;
y=x;
q=2e-6;     %电荷
k=9e9;      %常数    
[X,Y]=meshgrid(x,y);
rp=sqrt((X-a).^2+(Y-b).^2);         %设置变量求出r-