JEE Main Physics question
A load suspended by a massless spring produces an extension of cm in equilibrium. When it is cut into two unequal parts, the same load produces an extension of 7.5 cm when suspended by the larger part of length 60 cm. When it is suspended by the smaller part, the extension is 5.0 cm. Then
Answer: (A)
Solution
For a given load, a piece of length cut from a spring extends by an amount proportional to (since its spring constant is inversely proportional to its own length). So
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