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                                    0.A wire of resistance R is drawn through a disc sothat its length is increased three times. Its resistancenow is :(a) 3R(b) R/3(c) 9R(d) R/3V3 | 
                            
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Answer»  When length changes area also changes... R is directly proportional to square of length... Hence R=9R R/3 is the right answer because disc is increased by three times.  | 
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