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Questions  

A clock with an iron pendulum keeps correct time at 15°C. If the room temperature rises to 20°C, the error in seconds per day will be (coefficient of linear expansion for iron is 0.000012/°C)

a
2.5sec
b
2.6sec
c
2.4sec
d
2.2sec

detailed solution

Correct option is B

loss or gain in time per day =12aΔ86400

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