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1.
On increasing the length by 0.5 mm in a steel wire of length 2 m and area of cross-section 2 
the force required is 
the force required is
2.
When a force is applied on a wire of uniform cross-sectional area 
and length 4 m, the increase in length is 1mm. Energy stored in it will be
and length 4 m, the increase in length is 1mm. Energy stored in it will be
3.
The compressibility of water is 
. If one litre is subjected to a pressure of 
, the decrease in its volume is
. If one litre is subjected to a pressure of , the decrease in its volume is