CBSE Class 10 Answered
A wire of length l, area A is made in to a wire of double its length by -
Asked by akshitajain | 04 Feb, 2010, 08:31: PM
Expert Answer
Dear Student
Resistivity is a material constant , it wont changes with L or A.
R= p L/A p= resistivity, L =length, R=resistance
now let us see the cases 1, 2
(I) attaching a similar wire.
This is like 2 resistences in series ==> resistance will be doubled
(ii) Melting the existing wire
So area of cross section will be A/2, Length=2L ==> Resistance= p 2L/(a/2) =4p L/A = 4 times the initial resistance
Regards
Team
Topper leraning
Answered by | 05 Feb, 2010, 11:11: AM
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