One end of a horizontal thick copper wire of lengh 2L2R is welded to a

1.	One end of a horizontal thick copper wire of lengh 2L2R is welded to an end of another horizontathin copper witeh L and radius R. When the arrangement is stetcheapplying forces at two ends, the ratio ofwire to that in the thick wire is(a) 0.25(c) 2.00the elongation in tetJEE (Advanced) 2018(b) 0.50(d) 4.00Y=mg-formula would give Y if mg is doubledr 2L[MP PMT 2009,1M
Answer» F/π(2R)2/∆ℓ12L = F/πR2/∆ℓ2/L ∴ ∆ℓ2/∆ℓ1= 2option c

One end of a horizontal thick copper wire of lengh 2L2R is welded to an end of another horizontathin copper witeh L and radius R. When the arrangement is stetcheapplying forces at two ends, the ratio ofwire to that in the thick wire is(a) 0.25(c) 2.00the elongation in tetJEE (Advanced) 2018(b) 0.50(d) 4.00Y=mg-formula would give Y if mg is doubledr 2L[MP PMT 2009,1M

Answer»

F/π(2R)2/∆ℓ12L = F/πR2/∆ℓ2/L

∴ ∆ℓ2/∆ℓ1= 2option c

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