Physics-
General
Easy
Question
A copper rod of length L and radius ris suspended from the ceiling by one of its ends. What will be elongation of the rod due to its own weight when 
are the density and Young’s modulus of the copper respectively?
The correct answer is:
The weight of the rod can be assumed to act at its mid-point.
Now, the mass of the rod is
⟹ 
Here, 
L= length of the rod.
Now, we know that the Young’s modulus
⟹
or 
On putting the value of M from Eq.(i), we get
or
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