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Find the elastic potential energy in a s...

Find the elastic potential energy in a system shown below if the material of wires is same (Y= Young's modulus)

(1) `(4W^(2)L)/(pi R^(2)Y)`

(2) `(15)/(4)(W^(2)L)/(pi R^(2)Y)`

(3) `(19)/(5)(W^(2)L)/(pi R^(2)Y)`

(4) `(17)/(4)(W^(2)L)/(pi R^(2)Y)`

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