JEE Main Physics question
A light spring extends 40 mm when stretched by a force of 10 N, and for tensions up to this value the extension is proportional to the stretching force. Two such springs are joined end-to-end, and the double-length spring is stretched 40 mm beyond its natural length. The total strain energy, in joule, stored in the double spring is
Answer: (B)
Solution
Each spring has . Two such springs joined end-to-end (in series) give a
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