A Wire Of Length L, Area Of Cross Section A Is Hanging From A Fixed Support. The Length Of The Wire Changes To L1 When Mass M Is Suspended From Its Free End. The Expression For Young’s Modulus Is :

 (a) MgL1  / AL

(b) Mg(L1-L)/ AL

(c) MgL / AL1

(d) MgL / A(L1 -L)



Solution

Longitudinal stress can be defined as the force acting per unit cross-section of wire.


Longitudinal strain can be defined as the ratio of change in length of wire to original length.

 


According to Hook’s law, with in elastic limit. strain varies inversely  with stress

Where ‘Y’ is young’s modulus

 

 

Option D is correct 



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Milan Tomic

Hi. I’m Designer of Blog Magic. I’m CEO/Founder of ThemeXpose. I’m Creative Art Director, Web Designer, UI/UX Designer, Interaction Designer, Industrial Designer, Web Developer, Business Enthusiast, StartUp Enthusiast, Speaker, Writer and Photographer. Inspired to make things looks better.

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