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CBSE Class 10 Answered

<div>Find. Resistance<img src="https://images.topperlearning.com/topper/tinymce/imagemanager/files/ca84b61d3947afca092c22849784c1e25a3f73d0874706.56081813IMG20171224145040458.jpg" alt="" /></div>
Asked by shriya.pandey182 | 24 Dec, 2017, 03:02: PM
Expert Answer
It is assumed that all the resistances used in this netwrok are equal.
The given resistance netwrok( fig.(a) ) can be redrawn as shown in fig.(b). Note the points A, B, C and D in fig(a) and fig(b).
Figure (b) shows exactly balanced wheatstone bridge. If a potential difference is given across A and B, there will not be any current flow through the resistor connected across C and D, because C and D are at same potential. Hence the resistor coneected across C and D can be removed and the effective circuit is shown in figure (c). From figure (c) one can workout that the equivalent resistance is R.
Answered by | 25 Dec, 2017, 01:05: PM
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