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Q.

Resistance of a wire is  2Ω . It is drawn in such a way that it experiences a longitudinal strain of 200%. Its new resistance is

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a

18Ω

b

14Ω

c

8Ω

d

4Ω

answer is A.

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Detailed Solution

∆ll×100=200 ∆l=2l

∴l2-l1=2l⇒l2=3l

l∝R2, for sreached wire

R1R2=l12l22l23l2

2R2=l29l2⇒R2=18 ohm

 

 

 

 

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