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Q.

When a tension 'F' is applied, the elongation produced in uniform wire of length l, radius r is e, when tension 2F is applied, the elongation produced in another uniform wire of length 2l and radius 2r made of same material is:

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a

0.5e

b

1.0e

c

2.0e

d

1.5e

answer is B.

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Detailed Solution

e∝FLr2∵Y=FLAe

e1e2=F1L1F2L2r2r12

⇒ee2=FL2F2L2rr2=1 

A: 1.0e

 

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