A torsional pendulum consists of a solid...

A torsional pendulum consists of a solid disc connected to a thin wire `(alpha=2.4xx10^-5//^@C)` at its centre. Find the percentage change in the time period between peak winter `(5^@C)` and peak summer `(45%@C)`.

`9.6xx10^-4%`

`9.6xx10^-2%`

`6.9xx10^-4%`

`6.9xx10^-2%`

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