As the temperature is increased, the period of a pendulum [NCERT Exemplar]
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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 to centre of mass below the centre of the bob
d
decreases as its effective length remains same but the centre of mass shifts above the centre of the bob
answer is A.
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Detailed Solution
As the temperature is increased, length of the pendulum increases but its centre of mass remains at the centre of bob. The time period of pendulum, T=2πLg⇒T∝LSo, due to thermal expansion as L increases, time period (T) will also increases.