-
Notifications
You must be signed in to change notification settings - Fork 0
/
Metre Bridge-Resistance of a wire (Theory).html
211 lines (109 loc) · 8.12 KB
/
Metre Bridge-Resistance of a wire (Theory).html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en-IN" xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Metre Bridge-Resistance of a wire (Theory) : Physics Virtual Lab : Suryansh </title>
<link href="./Metre Bridge-Resistance of a wire (Theory)_files/tabs.css" rel="stylesheet" type="text/css"><link href="./Metre Bridge-Resistance of a wire (Theory)_files/main.css" rel="stylesheet" type="text/css"><link href="./Metre Bridge-Resistance of a wire (Theory)_files/bootstrap.min.css" rel="stylesheet" type="text/css"><link href="./Metre Bridge-Resistance of a wire (Theory)_files/custom.css" rel="stylesheet" type="text/css"><style>
#fl_banner div{
position:absolute;
}
div.mouseoverclass
{
background-color:#ffffff;
opacity:0.8;
filter:alpha(opacity=60); /* For IE8 and earlier */
position:absolute;
/*margin-left:220px;*/
width:180px;
text-align:center;
height:30px;
margin-top:20px;
font-size:24px;
vertical-align:middle;
margin-left:7px;
margin-right:5px;
/*
border:2px solid black;
text-align:center;
vertical-align:middle;*/
}
body{
background-color:#C0C0C0;
}
</style>
</head>
<body>
<div class="container" style="background-color:#e8e8e8;">
<div class=" row expContent">
<div class="row">
<div class="col-lg-12 col-sm-12 col-xs-12 detailsTop">
<div class="title">Metre Bridge-Resistance of a wire</div> </div>
</div>
<div>
<div class="row">
<div class="col-lg-12 col-sm-12 col-xs-12">
<div class="tabContent">
<div class="Row">
<div class="Cell hidden-xs hidden-sm" id="lcurve" style="width:24px; height:144px"></div>
<div class="Cell">
<nav class="navbar" id="mcurve">
<div class="navbar-header" id="navBrand">
<ul class="nav nav-tabs"><li class="active" id="activeTab"><a href="Metre Bridge-Resistance of a wire (Theory).html">
<p style="display:inline"><img src="./Metre Bridge-Resistance of a wire (Theory)_files/content_1.png">Theory </p>
</a></li>
</ul>
</div>
<div class="collapse navbar-collapse" id="myNavbar">
<ul class="nav navbar-nav nav_2 nav-tabs" id="tab">
<li class="active"><a href="Metre Bridge-Resistance of a wire (Theory).html">
<p style="display:inline"><img src="./Metre Bridge-Resistance of a wire (Theory)_files/content_1.png">Theory </p>
</a></li>
<li class=""><a href="Metre Bridge-Resistance of a wire (Procedure).html">
<p style="display:inline"><img src="./Metre Bridge-Resistance of a wire (Theory)_files/content_2.png">Procedure </p>
</a></li>
<li class=""><a href="Metre Bridge-Resistance of a wire (Simulator).html">
<p style="display:inline"><img src="./Metre Bridge-Resistance of a wire (Theory)_files/content_4.png">Simulator </p>
</a></li>
<li class=""><a href="Metre Bridge-Resistance of a wire (Video).html">
<p style="display:inline"><img src="./Metre Bridge-Resistance of a wire (Theory)_files/content_9.png">Video </p>
</a></li>
<li class=""><a href="Metre Bridge-Resistance of a wire (Viva Voce).html">
<p style="display:inline"><img src="./Metre Bridge-Resistance of a wire (Theory)_files/content_94.png">Viva Voce </p>
</a></li>
</ul>
</div>
</nav>
</div>
<div class="Cell hidden-xs hidden-sm" id="rcurve" style="width:24px; height:144px"></div>
</div>
</div>
</div>
</div>
<div class="divContent"><h1> Our Objective:</h1>
<p>To find the resistance of a given wire using a metre bridge and hence determine the specific resistance of its materials.</p>
<h1>Theory</h1>
<h2>Wheatstone’s principle</h2>
<p><img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/Wheatstone's Bridge.JPG"></p>
<p> The metre bridge is operates under Wheatstone’s principle. Here, four resistors P, Q, R, and S are connected to form the network ABCD. The terminals A and C are connected to a battery, and the terminals C and D are connected to a galvanometer through keys K1 and K2 respectively. In the balancing condition, there is no deflection on the galvanometer. Then,</p>
<p><img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/1513412641_MeterBridgeTheory1.png"></p>
<p> </p>
<h2>Metre Bridge apparatus </h2>
<p>The metre bridge, also known as the slide wire bridge consists of a one metre long wire of uniform cross sectional area, fixed on a wooden block. A scale is attached to the block. Two gaps are formed on it by using thick metal strips in order to make the Wheat stone’s bridge. The terminal B between the gaps is used to connect galvanometer and jockey.</p>
<p> <img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/1434024049_Untitled-1.jpg"> <img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/1434024204_Untitled-2.jpg"></p>
<p style="text-align: justify;">A resistance wire is introduced in gap S and the resistance box is in gap R. One end of the galvanometer is connected to terminal D and its other end is connected to a jockey. As the jockey slides over the wire AC, it shows zero deflection at the balancing point (null point).</p>
<p>If the length AB is <img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/1513412651_MeterBridgeTheory2.png">, then the length BC is ( 100-<em>l </em>).</p>
<p>Then, according to Wheatstone’s principle; </p>
<p> <img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/1513412659_MeterBridgeTheory3.png"> </p>
<p>Now, the unknown resistance can be calculated as,</p>
<p> <img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/1513412668_MeterBridgeTheory4.png"></p>
<p>The specific resistance or resistivity of the material of the wire can be then calculated by using the relation,</p>
<p> <img alt="" src="./Metre Bridge-Resistance of a wire (Theory)_files/1513412676_MeterBridgeTheory5.png"> ; Where L be the length of the wire and r be its radius.</p>
<h1><br>
Learning Outcomes:</h1>
<ul>
<li>Students understand Wheatstone’s bridge and Wheatstone’s principle.</li>
<li>Students verify Wheatstone’s principle.</li>
<li>Students correlate the principle of Wheatstone’s bridge with metre bridge experiment.</li>
</ul>
</div></div>
</div>
</div>
</body></html>