1.

A wire of radius r has resistance R.  If it is stretched to a radius of \[\frac{3r}{4}\], its resistance becomes               [BHU 2002]

A.            \[\frac{9R}{16}\]                 
B.            \[\frac{16R}{9}\]
C.            \[\frac{81R}{256}\]            
D.            \[\frac{256R}{81}\]
Answer» E.


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