A steel rod at 
is observed to be 
long when measured by another metal scale which is correct at 
. The exact length of steel rod at 
is ( 
and 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
As both steel rod and metal scale expands at 
,
True value of length of rod at 
Scale reading 
Where, 
coefficient of linear expansion
temperature at which observation is taken
and 
temperature at which metre scale reads correctly
Substituting values in (i), we get
Length of rod at 
Now, if 
length of steel rod at 
and
length of steel rod at 
, then we have
Substituting values, we have
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