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The force required to stretch a steel wi...

The force required to stretch a steel wire `1 cm^2` in cross section to double its length is (given `Y = 2 xx 10^(11) Nm^(-2))` ………. .

A

(a) `10^(7) N`

B

(b) `2 xx 10^(7) N`

C

(c) `10^(11) N`

D

`(d) 2 xx 10^(11) N`

Text Solution

Verified by Experts

The correct Answer is:
B
`F = (YA Delta l)/(l), "Here" Deltal = l implies F = YA`
`F = 2 xx 10^(11) xx 10^(-4) = 2 xx 10^(7) N`
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