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A pendulum clock gives correct time at 2...

A pendulum clock gives correct time at `20^@C`at a place where `g=9.800 m s^(-2)`.The pendulum consists of a light steel rod connected to a heavy ball. It is taken to a different place where `g=9.788 m s^(-2)`. At what temperature will it give correct time ? coefficient of linear expansion of steel `= 12 xx 10^(-6)C^(-1)`.

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The correct Answer is:
`82^(0)C`
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