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Q.

The time period of a mass suspended from a spring is T. If the spring is cut into four equal parts and the same mass is suspended from one of the parts, then the new time period will be

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a

T

b

T2

c

2 T

d

T4

answer is B.

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Detailed Solution

By cutting spring in four equal parts force constant (K) of each parts becomes four times ∵ k∝1l so by using T=2πmK; time period will be half i.e. T'=T/2

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