A steel scale measures the length of a copper wire as 
when both are at 
(the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 
? (Given α α steel 
per°C and α α copper 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
With temperature rise (same 25°C for both), steel scale and copper wire both expand. Hence
length of copper wire w.r.t. steel scale or apparent length of copper wire after rise in temperature
⇒ ⇒ 
= 80.0096 cm
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