A the temperature is increased, the time period of a pendulum

Options

A. increases as its effective length increases even though its centre of mass still remains at the centre of the bob.
B. decreases as its effective length increases even though its centre of mass still remains at the centre of the bob.
C. increases as its effective length increases due to shifting of centre of mass below the centre of the bob.
D. decreases as its effective length remains same but the centre of mass shift above the centre of the bob.

Answer

A

Explanation

With increase in temperature, the effective length (l) of simple pendulum increases even though its centre of mass still remain at the centre of the bob. As time period, `T= 2pi sqrt(l // g)` or `T prop sqrt(l)` so T increases as temperature increases.